The Jan. 29 collision over the Potomac River in Washington, DC — which preliminary reports have blamed on the military Black Hawk flying too high — was the deadliest US air disaster since 2001, and caused officials to change the flight path of helicopters near the airport.

The Army is pausing helicopter training flights around the Pentagon after a Black Hawk on Thursday forced two commercial airplanes to abort landings at Washington’s Ronald Reagan National Airport, three Army officials confirmed Monday.

The U.S. Army is pausing helicopter training flights in the vicinity of the Pentagon pending a review into two passenger airline flights that were forced to abort landings at Reagan Washington National Airport on Thursday because a Black Hawk helicopter was flying nearby.