Transcript for New questions after deadly NYC helicopter crash
turn now to the investigation into the deadly helicopter crash right here in New York City. The choerp slamming down on top of a building right here in Manhattan, killing the pilot on board. Take a look at the screen on the roof. You can barely make out the wreckage. Gio Benitez is in New York with more. Reporter: Yeah, the weather is a lot like it is now. Rainy and foggy. The big question for investigators, why was the helicopter in the air at all. This morning, NTSB investigators are work fog understand how a helicopter ended up in flames at the top of a New York City sky raise. We felt the shake and we saw debris falling off the side. I thought a plane hit the building. Reporter: This video shows a helicopter flying in the area minutes earlier. At times erratically. Officials cannot say definitively whether it's the doomed flights. These photos showing the wreckage. Very little was left behind. Theyen to Hutton was inside. Reporter: Someone giving you a shove. What's that. Reporter: They rush down starps. What is going through your mind? Everyone was anxious and jittery in the staircase. Now, we're in the lobby and we Reporter: Officials say there is no sign of terrorism but that is where many minds went. If you're a new Yorker, you have a level of PTSD from 9/11. As soon as you hear an aircraft hits a building, my mind goes where New York's mind goes. Reporter: Within on hour, the pilot, and the only person as board identified as Tim Mccormack, a volunteer firefighter. He spoke with ABC news after 2018 after his bird hit his wind A little bit of pandemonium, you try to gather yourself. Reporter: Those who knew him say he was a very experienced pilot but no word on how he ended up crash landing on top of a building or why he was flying the chopper in rainy and foggy weather. Incredibly here on the ground no injuries. In the building behind me no injuries. That chop her crashed here on the busy streets near times square, we would be having a very different discussion this morning. You hate to think about what would have happened. Thank you.
This transcript has been automatically generated and may not be 100% accurate.