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.

No survivors have been found after an American Airlines regional jet and an Army helicopter collided midair near Washington, D.C. Wednesday evening. Rescue crews recovered 27 bodies from the plane and one from the helicopter,