Marathon bombing survivor Jeff Bauman greets his wife Erin Hurley after she completed the 120th Boston Marathon. (WBZ-TV)
2016 Boston Marathon
Runners react after crossing the finish line to complete the 120th Boston Marathon. (Photo by Maddie Meyer/Getty Images)
2016 Boston Marathon
Runners are seen wearing blankets after completing the 120th Boston Marathon. (Photo by Maddie Meyer/Getty Images)
2016 Boston Marathon
A member of the United States military approaches the finish line during the 120th Boston Marathon. (Photo by Mike Lawrie/Getty Images)
2016 Boston Marathon
Patrick Downes, bombing survivor, finishes 120th BostonMarathon and hugs Martin Richard's dad. (Photo credit: David Wade/WBZ-TV)
2016 Boston Marathon
Runners carry a "Boston Strong" banner during the 120th Boston Marathon. (Photo by Mike Lawrie/Getty Images)
2016 Boston Marathon
Miharu Shimokado of Japan crosses the finish line during the 120th Boston Marathon. (Photo by Mike Lawrie/Getty Images)
2016 Boston Marathon
Boston Marathon bombing survivor Patrick Downes celebrates with the Martin Richard family after finishing the 120th Boston Marathon. (Photo by Maddie Meyer/Getty Images)
2016 Boston Marathon
Marathon bombing survivors Patrick Downes and Jessica Kensky celebrate at the finish line after Downes completed the 120th Boston Marathon. (Photo by Maddie Meyer/Getty Images)
2016 Boston Marathon
Marathon bombing survivors Patrick Downes and Jessica Kensky celebrate at the finish line with their dog Rescue after Downes completed the 120th Boston Marathon. (Photo by Maddie Meyer/Getty Images)
2016 Boston Marathon
Marathon bombing survivors Patrick Downes and Jessica Kensky celebrate at the finish line with their dog Rescue after Downes completed the 120th Boston Marathon. (Photo by Maddie Meyer/Getty Images)
2016 Boston Marathon
Marathon bombing survivor Patrick Downes with his wife and fellow bombing survivor Jessica Kensky after he completed the 120th Boston Marathon. (Photo credit: Scott Sullivan/WBZ-TV)
2016 Boston Marathon
Boston Marathon bombing survivor Patrick Downes completed the 2016 race and then embraced his wife and fellow bombing survivor Jessica Kensky. (WBZ-TV)
2016 Boston Marathon
A runner shows off his "Boston Strong" banner while running at the 120th Boston Marathon. (Photo credit: Scott Sullivan/WBZ-TV)
2016 Boston Marathon
Team Hoyt completes yet another Boston Marathon. (WBZ-TV)
2016 Boston Marathon
U.S. Army Officer Albert Man from Quincy participating in his fourth Boston Marathon while running in full gear on Monday. (Photo credit: Scott Sullivan/WBZ-TV)
2016 Boston Marathon
A runner celebrated while crossing the finish line during the 120th Boston Marathon. (Photo by Maddie Meyer/Getty Images)
2016 Boston Marathon
Runners react after crossing the finish line to complete the 120th Boston Marathon. (Photo by Maddie Meyer/Getty Images)
2016 Boston Marathon
A runner kissed the finish line upon completing the Boston Marathon on Patriots Day. (Photo credit: Scott Sullivan/WBZ-TV)
2016 Boston Marathon
Runners tote an American flag while participating in the 120th Boston Marathon. (Photo credit: Scott Sullivan/WBZ-TV)
2016 Boston Marathon
Runners near the finish line on Boylston Street during the 120th Boston Marathon. (Photo by Mike Lawrie/Getty Images)
2016 Boston Marathon
A runner celebrates by "dabbing" at the 120th Boston Marathon. (Photo credit: Scott Sullivan/WBZ-TV)
2016 Boston Marathon
Uta Pippig of Team Hoyt completed the 120th Boston Marathon on Monday. (Photo credit: Joe Giza/WBZ-TV)
2016 Boston Marathon
A man struggled at the finish line but managed to complete the 2016 Boston Marathon. (WBZ-TV)
2016 Boston Marathon
Atsede Baysa and Lemi Berhanu Hayle together after winning the women's and men's races, respectively, at the 120th Boston Marathon. (Photo credit: Joe Giza/WBZ-TV)
2016 Boston Marathon
Lemi Berhanu Hayle of Ethiopia receives a standing ovation after winning the 2016 Boston Marathon. (WBZ-TV)
2016 Boston Marathon
Atsede Baysa receives her trophy for winning the women's race at the 2016 Boston Marathon. (WBZ-TV)
2016 Boston Marathon
Lemi Berhanu Hayle of Ethiopia won the 2016 Boston Marathon. (WBZ-TV)
2016 Boston Marathon
Atsede Baysa won the women's race at the 2016 Boston Marathon. (Photo credit: Ken Tucci/WBZ-TV)
2016 Boston Marathon
Marcel Hug and Tatyana McFadden won the men's and women's wheelchair races, respectively, at the 2016 Boston Marathon. (Photos by Scott Sullivan/WBZ-TV)
2016 Boston Marathon
Tatyana McFadden (Photo credit: Joe Giza/WBZ-TV)
2016 Boston Marathon
Past Boston Marathon winner Meb Keflezighi visits with Tatyana McFadden after she won the women's wheelchair race at the 2016 Boston Marathon. (Photo credit: Joe Giza/WBZ-TV)
2016 Boston Marathon
Bobbi Gibb, the first woman to run the Boston Marathon, crosses the finish line during the 120th Boston Marathon. (Photo by Maddie Meyer/Getty Images)
2016 Boston Marathon
The start of the women's wheelchair race. (WBZ-TV)
2016 Boston Marathon
Adrianne Haslet running the 2016 Boston Marathon. (WBZ-TV)
2016 Boston Marathon
Runners gathered before the start of the women's elite race. (WBZ-TV)
2016 Boston Marathon
Spectators at the beginning of the marathon course in Hopkinton. (WBZ-TV)
2016 Boston Marathon
Carlos and Melida Arredondo near the finish line. (Photo by Mike Lawrie/Getty Images)
2016 Boston Marathon
Finishers medals sit at the end of the 120th Boston Marathon. (Photo by Maddie Meyer/Getty Images)
2016 Boston Marathon
Bombing survivor Adrianne Haslet crosses Boston Marathon finish line (WBZ-TV)
2016 Boston Marathon
Adrianne Haslet crosses Boston Marathon finish line (Photo credit: Chantee Lans/WBZ)