crews are still searching the wreckage and going over passengers a lists and trying to make sure everyone is accounted for. investigators are looking for clues about the cause of the accident. kate bolduan is on the scene. give us a sense of what's happening right now? >> wolf you laid it out well but there's a ton of activity right here on the scene still. you can kind of see some of the activity behind me traffic obviously starting to flow here again in philadelphia. what's going on back there is they're just beginning really to kind of wrap their arms around the huge task in front of investigators. earlier just a couple hours ago when the ntsb came forward, they said they were just about to get their efforts under way because they were letting priority be where it should have been. search and rescue efforts as emergency crews were on the scene. they needed to clear out for ntsb investigators to get their teams in to start the arduous task of figuring out and mapping what really is almost like a