Crews are searching for survivors after an American Airlines regional jet and a Black Hawk helicopter crashed last night.

Officials say the conditions of the Potomac River are complicating recovery efforts of the bodies of the 67 presumed dead in a mid-air collision between American Airlines flight 5342 from Wichita and a military Black Hawk helicopter.

Residents and visitors were told to not touch or remove debris from the Potomac River, as the investigation into the midair D.C. plane crash remains ongoing.