the csx train has been ruling out. there were reports of other trains on the track, et cetera. we do know it was headed towards that turn so i did think the mayor did convey a fair amount of information, but he's right, it's impossible to tell if there was a defect in the track, if the train was traveling too fast if there was a defect in the train or the engine or and the fbi says there's no evidence there's something wrong, tampering with the track. those things are still unknown and they don't have any information on that. but at least we now know there wasn't another train on the track, which is really important information, because that would have been a totally different kind of a situation or a disaster to deal with. it may have even been worse. >> the big news out of this, matthew l. wald five people dead from this. and there are many people who are injured. five people dead in this train accident in philadelphia.