CNN At This Hour With Berman and Bolduan May 18, 2015 15:26:00
Philadelphia for us this morning. the fbi on the scene investigating the situation. any sense of what they're finding yet? >> reporter: we're hoping to hear more of the fbi's analysis expected to happen today. we know they are taking a very close look at a fist-sized circular mark located on the left-hand side of that windshield. investigators say it might be possible to be the result of some sort of projectile that struck the train prior to the crash. however, today there are new doubts about information that came from the train's assistant conductor. she told investigators she thought she he...