Federal investigators have opened their first probe of a midair collision between a civilian drone and a traditional aircraft.

An Army UH-60 helicopter was flying east of Staten Island on Sept. 21 when it collided with a small, consumer Phantom 4 drone, the National Transportation Safety Board said in a press release Thursday.

The NTSB released a photo of the helicopter's rotor blade with scrape marks that occurred in the collision. The helicopter pilot was able to land safely and there were no reports of injuries.