The Cape Cod, Massachusetts, Police Department SWAT team search houses for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. (TIMOTHY A. CLARY/AFP/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
The Cape Cod, Massachusetts, Police Department SWAT team search houses for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. (TIMOTHY A. CLARY/AFP/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
The Cape Cod, Massachusetts, Police Department SWAT team search houses for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. (TIMOTHY A. CLARY/AFP/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
The Cape Cod, Massachusetts, Police Department SWAT team search houses for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. (TIMOTHY A. CLARY/AFP/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
The Cape Cod, Massachusetts, Police Department SWAT team search houses for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. (TIMOTHY A. CLARY/AFP/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
The Cape Cod Police Department SWAT team search houses for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. (TIMOTHY A. CLARY/AFP/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Boston Mayor Thomas Menino (L, in wheelchair) speaks as Massachusetts Governor Deval Patrick (R), Boston Police Commissioner Ed Davis (L, behind Menino) and Watertown Chief of Police Edward P. Deveau (R, behind Patrick) listen at the Watertown Mall as a search for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. (STAN HONDA/AFP/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A Massachusetts state trooper watches other troopers line up at the Watertown Mall as a search for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. (STAN HONDA/AFP/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
The Nashua (New Hampshire) Police Department SWAT team prepares in the Watertown Mall as a search for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. (STAN HONDA/AFP/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A National Guard helicopter prepares to land behind the Watertown Mall as a search for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. (STAN HONDA/AFP/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A Boston SWAT team member takes up as posistion as they search for 19-year-old bombing suspect Dzhokhar A. Tsarnaev on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police seal off Arsenal Street during a search for 19-year-old bombing suspect Dzhokhar A. Tsarnaev April 19, 2013 in Watertown, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
South Station in Boston, Massachusetts was shut down and heavily guarded with police in response to the shootings in Cambridge and Watertown, on the morning of April 19, 2013. (Photo by Kayana Szymczak/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A stranded traveler waits outside South Station on April 19, 2013 in Boston, Massachusetts. South Station was shut down and heavily guarded with police in response to the early morning shootings in Cambridge and Watertown, Massachusetts. (Photo by Kayana Szymczak/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
South Station in Boston, Massachusetts was shut down and heavily guarded with police in response to the shootings in Cambridge and Watertown, on the morning of April 19, 2013. (Photo by Kayana Szymczak/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
South Station in Boston, Massachusetts was shut down and heavily guarded with police in response to the shootings in Cambridge and Watertown, on the morning of April 19, 2013. (Photo by Kayana Szymczak/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
People watch as SWAT team members search for 19-year-old bombing suspect Dzhokhar A. Tsarnaev on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A Boston Police officer searches around the perimeter of South Station for suspicious material after two bullets were found outside of the T stop on April 19, 2013 in Boston, Massachusetts. (Photo by Kayana Szymczak/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A Boston Police officer and detective search South Station for suspicious material after two bullets were found outside of the T stop on April 19, 2013 in Boston, Massachusetts. (Photo by Kayana Szymczak/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Boston Police detective searches outside of South Station for suspicious material after two bullets were found outside of the T stop. South Station in Boston, Massachusetts was shut down and heavily guarded with police in response to the shootings in Cambridge and Watertown, on the morning of April 19, 2013. (Photo by Kayana Szymczak/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A Boston Police officer searches outside of South Station for suspicious material after two bullets were found outside of the T stop on April 19, 2013 in Boston, Massachusetts. (Photo by Kayana Szymczak/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A Boston Police officer and detective search South Station for suspicious material after two bullets were found outside of the T stop on April 19, 2013 in Boston, Massachusetts. (Photo by Kayana Szymczak/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police are seen standing outside of South Station on April 19, 2013 in Boston, Massachusetts. South Station was shut down and heavily guarded with police in response to the early morning shootings in Cambridge and Watertown, Massachusetts. (Photo by Kayana Szymczak/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A SWAT team member scouts the perimeter of South Station on April 19, 2013 in Boston, Massachusetts. South Station was shut down and heavily guarded with police in response to the early morning shootings in Cambridge and Watertown, Massachusetts. (Photo by Kayana Szymczak/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
People are evacuated from a home near to a home police thought the one remaining suspect might have been hiding on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
South Station in Boston, Massachusetts was shut down and heavily guarded with police in response to the shootings in Cambridge and Watertown, on the morning of April 19, 2013. (Photo by Kayana Szymczak/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police officers run towards a home they believed 19-year-old bombing suspect Dzhokhar A. Tsarnaev may be hiding on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
FBI Release Images Of Boston Marathon Bombing Suspect
In this image released by the Federal Bureau of Investigation (FBI) on April 19, 2013, Dzhokar Tsarnaev, a suspect in the Boston Marathon bombing is seen. (Photo provided by FBI via Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, survey the perimeter near the home of suspect #2 on Norfolk Street April 19, 2013 in Cambridge, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Federal agents descend on the home of a suspect-at-large in the Boston Marathon bombing and nearby Watertown shooting, on Norfolk Street April 19, 2013 in Cambridge, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A man looks in Moscow on April 19, 2013, at a computer screen displaying an undated picture the 19-year-old Dzhokhar Tsarnaev posted on his is page in VKontakte, a Russian social media site. (AFP/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police search for one remaining suspect at an apartment building where a resident reported finding drops of blood on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A Massachusetts State Police officer checks the bag of a cyclist during heightened security on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
SWAT team members search for one remaining suspect at a residential building as a man looks out from a window on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Residents take pictures and look on as members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, survey the perimeter on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, survey the perimeter on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, put up police tape securing a perimeter in front of a woman being questioned by the FBI on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A woman reacts while being questioned by the FBI and other law enforcement agencies on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Residents of an apartment building watch as members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, survey the perimeter on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, survey the perimeter on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A woman reacts while being questioned by the Cambridge Police and other law enforcement agencies on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, survey the perimeter on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, survey the perimeter on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A woman reacts while being questioned by the FBI and other law enforcement agencies while residents look out of their windows on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, survey the perimeter on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A dog sniffs equipment before Massachusetts Governor Deval Patrick spoke to the media at a shopping mall on the perimeter of a locked down area as a search for the second of two suspects wanted in the Boston Marathon bombings takes place on April 19, 2013 in Watertown, Massachusetts. (STAN HONDA/AFP/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Colonel Timothy Albens (C, at microphone), Massachusetts State Police, with Massachusetts Governor Deval Patrick (R) and Boston Police Commissioner Ed Davis (L) speaks to the media at a shopping mall on the perimeter of a locked down area as a search for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. (STAN HONDA/AFP/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Massachusetts Governor Deval Patrick (L) speaks to the media at a shopping mall on the perimeter of a locked down area as a search for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. (STAN HONDA/AFP/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Onlookers take pictures as they watch from windows while SWAT team members search for one remaining suspect at a neighboring apartment building on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
SWAT team members search for one remaining suspect at a residential building on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
SWAT team members prepare to search for one remaining suspect at an apartment building on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
SWAT team members aim their guns as they search for one remaining suspect at an apartment building on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police convene on School and Walnut Street on April 19, 2013 in Watertown, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
An elderly woman is evacuated from the School and Walnut streets area as police prepare to conduct a massive search for the one remaining suspect on April 19, 2013 in Watertown, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Metro SWAT members hang off the back of a truck as they prepare to search the School and Walnut Street neighborhood for one remaining suspect on April 19, 2013 in Watertown, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Military Police arrive in armoured vehicles at the parking lot of the Arsenal Mall on April 19, 2013 in Watertown, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A Watertown Police official speaks during a media briefing in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Boston Police mobilize in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Boston Police Commissioner Edward Davis (L) and a Watertown Police official speak during a media briefing in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police walk down School and Walnut Street on April 19, 2013 in Watertown, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police on School and Walnut Street as the search continues for a suspect on April 19, 2013 in Watertown, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police convene on School and Walnut Street on April 19, 2013 in Watertown, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police on School and Walnut Street on April 19, 2013 in Watertown, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Boston Police mobilize in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Boston Police mobilize in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Boston Police mobilize in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Boston Police mobilize in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Boston Police mobilize in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Boston Police Commissioner Edward Davis speaks during a media briefing in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Boston Police Commissioner Edward Davis speaks during a media briefing in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police with guns drawn search for a suspect on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A police officer with dog patrol School and Walnut Street as the search for suspects continues on April 19, 2013 in Watertown, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police descend on School and Walnut Street chasing possible suspects on April 19, 2013 in Watertown, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police descend on School and Walnut Street chasing possible suspects on April 19, 2013 in Watertown, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police descend on School and Walnut Street chasing possible suspects on April 19, 2013 in Watertown, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police with guns drawn search for a suspect on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A police officer with gun drawn and flashlight searches for a suspect on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police detain a man who was later released on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A police officer lifts police tape for a police car to pass under on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A woman asks a police officer when she will be allowed back to her home in a cordoned off area on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A police officer runs with his gun drawn while searching for a suspect on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police investigate along Dexter Avenue in the early morning hours on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Boston Police gather in the parking lot in front of a Best Buy store, near the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police gather while searching for a suspect on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Boston Police Commissioner Edward Davis speaks during a media briefing in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Boston Police gather in the parking lot in front of a Best Buy store on April 19, 2013 near the Watertown Mall in Watertown, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Boston Police gather in the parking lot in front of a Best Buy store on April 19, 2013 near the Watertown Mall in Watertown, Massachusetts. (Photo by Jared Wickerham/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police descend on School and Walnut Street chasing possible suspects on April 19, 2013 in Watertown, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police set up a perimeter outside the Arsenal Mall as they pursue possible suspects following a spate of shootings on April 19, 2013 in Watertown, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police search a building near the Arsenal Mall following a spate of shootings on April 19, 2013 in Watertown, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police descend on School and Walnut streets in search of suspects April 19, 2013 in Watertown, Massachusetts. (Photo by Darren McCollester/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A police officer with gun drawn searches for a suspect on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police with guns drawn search for a suspect on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
Police with guns drawn search for a suspect on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
Manhunt For Boston Marathon Bombing Suspects
A police officer runs with gun drawn while police search for a suspect on April 19, 2013 in Watertown, Massachusetts. (Photo by Mario Tama/Getty Images)
