Celeste and Sydney Corcoran describe surviving the Boston Marathon bombings in an exclusive interview with NBC News' Natalie Morales. In a memorable photo from the scene, Sydney Corcoran, 18, is seen being helped by a stranger. Her mother, Celeste, was also wounded and had to have her legs amputated.
John Tlumacki/Boston Globe via Getty Images
Bystanders help Sydney Corcoran, a 17-year-old senior at Lowell High School, at the scene of the first explosion on Boylston Street near the finish line of the 117th Boston Marathon.
Celeste Corcoran, 47, and Sydney Corcoran, 18, were badly injured in the the Boston marathon bombings.