step. brian? >> what an obscene toll of human damage by these two men. anne thompson in the great city of boston tonight. anne, thanks. we also have an update tonight on the corcoran family whose terrible suffering after the bombing moved so many people around the world who heard their story. the mother had both legs amputated, and the frantic effort to help her daughter became one of the sadly enduring images of this tragedy. tonight their family is speaking to natalie morales for the first time. >> talking about here where it is a very tense situation in watertown -- >> reporter: as the nation watched the events unfold over the last 24 hours, kevin corcoran watched, too. at boston medical center. the hospital was on lockdown for much of the day. but kevin's been here since monday, ever since his wife, celeste, and their 17-year-old