In Boston, the rush to help survivors has turned into a search for answers. Everyone in the city is asking how and why their marathon was attacked -- none more so than the survivors. Nicholas Yanni and his wife, Lee Ann, were watching a friend finish the race when the bombs went off. They were standing only ten feet away. Dr. David Mooney was one of those on the front lines at Boston Children's Hospital. He's the director of the trauma program. And Jack Cloonan is a security consultant and former FBI terrorism investigator.