Following a few weeks of speculation on the legitimacy of the claim, the National Transportation Safety Board (NTSB) is reporting that a DJI Phantom 4 drone did collide with an Army UH-60 helicopter last month.
According to the NTSB, at approximately 7:20 p.m. on Sept. 21, the unmanned aerial vehicle (UAV) and the helicopter collided east of Staten Island, NY …
https://unmanned-aerial.com/ntsb-investigates-drone-helicopter-collision-new-york
Unmanned Aerial | Oct. 5, 2017