Boston Marathon bombing: Iconic images
The iconic images of the April 15, 2013 Boston Bombing are seared into the nation's memory after two explosives went off near the finish line creating widespread terror, killing three, and wounding 264 others.
Tamerlan Tsarnaev, 26, one of the two brothers responsible for the attacks, was killed soon after.
In this photo, police react to a runner who was knocked down after the second explosion near the finish line of the 2013 Boston Marathon.
Boston Marathon bombing
Boston Firefighter James Plourde carries an injured girl away from the scene after a bombing near the finish line of the 2013 Boston Marathon.
Boston Marathon bombing
Medical responders run an injured man past the finish line at the 2013 Boston Marathon following an explosion, April 15, 2013.
Boston Marathon bombings
A man comforts a victim on the sidewalk at the scene of the first explosion near the finish line of the 117th Boston Marathon.
The search for bombers in Watertown
A police officer evacuates a shoeless man holding a child as members of law enforcement conduct a search for Dzhokhar Tsarnaev, in Watertown, Mass., April 19, 2013.
Boston Marathon bombings
A runner embraces another woman on the marathon route near Kenmore Square after two bombs exploded during the 117th Boston Marathon in Boston, Mass., April 15, 2013.
Boston Marathon bombings
A runner sits near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Mass.
Washington, D.C.
President Barack Obama talks on the phone with FBI Director Robert Mueller to receive an update on the explosions that occurred in Boston, in the Oval Office, April 15, 2013.
Memorial, Boston bombing victims
A young girl cries with her mother during the vigil for 8-year-old Martin Richard, from Dorchester, who was killed by an explosion near the finish line of the Boston Marathon, April 16, 2013 at Garvey Park in Boston, Mass.
Boston Marathon bombings
In this image released by the FBI on April 19, 2013, Dzhokhar and Tamerlan Tsarnaev, the two suspects in the Boston Marathon bombing, walk near the marathon finish line, April 15, 2013 in Boston, Mass.
The search for bombers in Watertown
Police officers guard the entrance to Franklin street during the active crime scene search for the suspect in the Boston Marathon bombings, April 19, 2013, in Watertown, Mass.
The search for bombers in Watertown
Police convene on School and Walnut Street in Watertown, Massa., April 19, 2013. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge.
The search for bombers in Watertown
Resident Rosie Meyer (C), who said she heard gunshots, reacts while watching police respond in Watertown, Mass., April 19, 2013. After a car chase and shoot out with police, one suspect in the Boston Marathon bombing, Tamerlan Tsarnaev, 26, was shot and killed by police early morning of April 19.
The search for bombers in Watertown
Police in tactical gear seen outside a home in Watertown, Mass., April 19, 2013.
The search for bombers in Watertown
Residents flee from an area where a suspect is hiding on Franklin St. in Watertown, Mass., April 19, 2013.
The search for bombers in Watertown
The boat in which Boston Marathon bombing suspect Dzhokhar A. Tsarnaev was hiding is seen from the Forward Looking Infrared setting of a police helicopter on Franklin Street in Watertown, Mass., April 19, 2013.
The search for bombers in Watertown
Investigators work around the boat where Dzhokhar A. Tsarnaev was found hiding after a massive manhunt, in the backyard of a Franklin Street home, in an aerial view, in Watertown, Mass., April 20, 2013.
Memorial, Boston bombing victims
Items are placed by people visiting a makeshift memorial for victims near the site of the Boston Marathon bombings at the intersection of Boylston Street and Berkley Street two days after the second suspect was captured on April 21, 2013 in Boston, Mass.
Memorial, Boston bombing victims
Photos of the deceased are displayed during Mass at the Cathedral of the Holy Cross on the first Sunday after the Boston Marathon bombings in Boston, Mass., April 21, 2013.
Boston Strong
Signatures adorn a Boston Marathon poster near the site of the Boston Marathon bombings, in Boston, Mass., April 23, 2013.