The U.S. Army unit whose helicopter was involved in the overnight collision with a passenger jet near Washington has been placed on an operational pause, two U.S. officials told Reuters on Thursday, meaning helicopters from that unit will not be flying for the time being.

The crash of an American Airlines passenger jet and a U.S. Army Black Hawk helicopter near Reagan Washington National Airport on Wednesday highlighted issues around the congested airspace shared by civilian and military aircraft over the U.