2016 Boston Marathon
In the third running of the race since a pair of ethnic Chechen brothers killed three people and injured more than 260 with a finish-line bombing attack, some 30,000 runners competed on Monday in the 120th Boston Marathon, April 18, 2016.
Ethiopions Atsede Baysa won the women's division and Lemi Berhanu Hayle won the men's race.
Amidst tight security, the 2013 Boston Marathon bombing was remembered with memorials, appearances by survivors and family members.
This year's race celebrates a half-century of women competing in the marathon -- from the time blonde housewife Bobby Gibb broke barriers and the finish-line tape by sneaking into the race wearing her brother's Bermuda shorts and a hoodie covering her long hair.
Here, Boston Marathon bombing survivor Adrianne Haslet, center, starts the 120th Boston Marathon on April 18, 2016, in Hopkinton, Mass.
Atsede Baysa & Lemi Berhanu Hayle
Atsede Baysa, left, and Lemi Berhanu Hayle, both of Ethiopia, pose for photos after they won the women's and men's divisions of the 120th Boston Marathon on Monday, April 18, 2016.
The marathon, the world's oldest continually run annual marathon, includes many of the world's elite.
Winner - Lemi Berhanu Hayle
Lemi Berhanu Hayle of Ethiopia crosses the finish line to win the men's division of the 120th running of the Boston Marathon, April 18, 2016.
Winner - Lemi Berhanu Hayle
Lemi Berhanu Hayle of Ethiopia celebrates after winning the 2016 Boston Marathon men's elite division, April 18, 2016.
Winner - Atsede Baysa
Atsede Baysa of Ethiopia crosses the finish line to win the women's division with a time of the 120th running of the Boston Marathon with a time of of 2:29:19 on April 18, 2016.
Boston Marathon - Atsede Baysa
Atsede Baysa of Ethiopia after winning the 2016 Boston Marathon women's division, April 18, 2016.
120th Boston Marathon
A runner holds up a rose as she finish the 120th running of the Boston Marathon, April 18, 2016.
Jeff Bauman
Boston Marathon bombing survivors Jeff Bauman and Celeste Corcoran embrace at the finish line of the 120th running of the Boston Marathon, April 18, 2016.
Bauman, well-known because of the photo of him and first-responder Carlos Arredondo at the scene of the 2013 bombing, had to have both his legs amputated because of his injuries.
Boston Marathon
Runners approach the finish line carrying a Boston Strong banner during the 120th running of the Boston Marathon, April 18, 2016.
Bombing survivor - Celeste Corcoran
Celeste Corcoran, who lost both her legs in the Boston Marathon bombings, greets runners at they finish the120th running of the Boston Marathon, April 18, 2016.
Marathon wedding proposal
Harry Moutlon proposes to Kellie Marshall after they completed the 120th running of the Boston Marathon, April 18, 2016.
Marathon wedding proposal
Apr 18, 2016; Boston, MA, USA; Thomas Ost proposes to Tracy Sik both of USA after finishing the 120th Boston Marathon. Mandatory Credit: Greg M. Cooper-USA TODAY Sports
Marathon bombing survivor
Boston Marathon bombing survivor Patrick Downes, second from left, crosses the finish line with companions during the the 120th Boston Marathon on Monday, April 18, 2016.
Bombing survivor
Boston Marathon bombing survivor Patrick Downes hugs his wife Jessica after finishing the the 120th Boston Marathon on Monday, April 18, 2016. Both lost a leg in the 2013 bombings.
Bombing survivor
Matthew Cox, of Wells, Maine, talks with Bill Richard, whose son Martin Richard was killed in the 2013 Boston Marathon bombings, after Cox crossed the finish line of the 120th running of the Boston Marathon, April 18, 2015.
Carlos Arredondo
Carlos Arredondo, left, a 2013 Boston Marathon bombing first-responder, greets three-time Boston Marathon women's division winner Uta Pipping after she crossed the finish line of the 120th Boston Marathon on Monday, April 18, 2016.
Arrendondo came to the aide of Jeff Bauman, tying a tourniquet around one of his severely injured legs during the 2013 attacks. Bauman also attended the race.
Boston Marathon
Alejandro Ortega, of Mexico, is wheeled from the finish line of the 120th Boston Marathon on Monday, April 18, 2016, in Boston.
Boston Marathon
Elite runners make their way along the course during the 2016 Boston Marathon.
Boston Marathon security
Boston police check bags of spectators near the finish line before the start of the 120th running of the Boston Marathon in Boston, April 18, 2016.
Security is tight three years after the marathon bombing. One of the bombers, Dzhokhar Tsarnaev, was sentenced to death in June 2015. His brother, Tamerlan, died in a gunfight with police in the days after the attack.
Remembering Boston bombing victims
People observe a moment of silence at the site where the first of two bombs detonated at the Boston Marathon finish line on the third anniversary of the bombings, Friday, April 15, 2016, in Boston.
Boston bombing memorial
An image of MIT police Officer Sean Collier who was killed days after the Boston Marathon attacks adorns a tree near the finish line before the start of the 120th running of the Boston Marathon, April 18, 2016.
Boston Marathon security
Boston police officers with a police dog patrol near the finish line of the 120th running of the Boston Marathon in Boston, April 18, 2016.
Boston bombing memorial
A make-shift memorial dedicated to those killed in the 2013 Boston Marathon bombings adorns a tree near the finish line before the start of the 120th running of the Boston Marathon in Boston, April 18, 2016.
Boston Marathon security
Police officers watch the finish line of the 2016 Boston Marathon from nearby rooftops, April 18, 2016.
Boston Marathon
Tatyana McFadden of the United States accepts the first place trophy after winning women's wheelchair division of the 120th Boston Marathon in Boston, Massachusetts April 18, 2016.
Boston Marathon
Marcel Hug of Switzerland accepts the first place trophy after winning men's wheelchair division of the 120th Boston Marathon in Boston, Massachusetts April 18, 2016.
Men's wheelchair division
Marcel Hug of Switzerland crosses the finish line ahead of Kurt Fearnley of Australia (C) and Ernst Van Dyk of South Africa (R) to win the men's wheelchair division of the 120th Boston Marathon, April 18, 2016.
Boston Marathon
Apr 18, 2016; Boston, MA, USA; Kathryn McCauley of the USA crosses the finish line of the 120th Boston Marathon. Mandatory Credit: Greg M. Cooper-USA TODAY Sports
Boston Marathon security
Police muster near the finish line before the 120th Boston Marathon on Monday, April 18, 2016, in Boston.
Bobbi Gibb
Bobbi Gibb, first woman to run the Boston Marathon in 1966, waves to the crowd at the finish line of the 120th Boston Marathon on Monday, April 18, 2016.
Fifty years after "blonde housewife" Bobbi Gibb sneaked into the Boston Marathon wearing her brother's Bermuda shorts and a hoodie covering her long hair, the race celebrates a half-century of women who broke barriers and the finish-line tape.
120th Boston Marathon
A member of the U.S. military does push-ups on the finish line during the 120th running of the Boston Marathon, April 18, 2016.
120th Boston Marathon
Family members of Boston Marathon bombing victim Martin Richard, Bill, second from left, Denise, center left, Jane, center right, and Henry, left, along walk down Boylston Street in Boston with Boston Mayor Marty Walsh, foreground right, after placing a wreath on the third anniversary of the bombings, Friday, April 15, 2015.
Bombing survivor Jeff Bauman
Boston Marathon bombing survivor Jeff Bauman, center, walks over the marathon finish line on the third anniversary of the bombings, Friday, April 15, 2016, in Boston.
Bauman, well-known because of the photo of him and first-responder Carlos Arredondo at the scene of the 2013 bombing, had to have both his legs amputated because of his injuries.
Boston Marathon
Members of the U.S. women's Olympic marathon team, from right, Shalane Flanagan, Des Linden and Amy Cragg stand after being introduced during a news conference in Boston, Friday, April 15, 2016.
Remembering bombing victims
Denise Richard, mother of Boston Marathon bombing victim Martin Richard, hugs a police officer prior to a wreath laying ceremony on the third anniversary of the bombings in Boston, April 15, 2016.