President Donald Trump questioned the actions of the Reagan Airport’s flight control tower in Washington, D.C. after an American Airlines plane and military helicopter collided in midair Wednesday night. Trump said he had been fully briefed on the matter by his cabinet.

“It is a CLEAR NIGHT, the lights on the plane were blazing, why didn’t the helicopter go up or down, or turn. Why didn’t the control tower tell the helicopter what to do instead of asking if they saw the plane,” President Trump posted on Truth Social.

Trump said that based on the flight path, the airplane was on a routine line approach, and the helicopter was headed straight at it for an extended period of time.

“This is a bad situation that looks like it should have been prevented. NOT GOOD!!!” the president posted.

Sixty passengers and four crew members were aboard the plane, according to American Airlines. Defense officials told CNN that three people were aboard the Black Hawk helicopter.

The Defense Department confirmed the aircraft was an Army helicopter on a training mission out of Fort Belvoir, 12 miles southwest of Reagan.

The incident led to a full ground stop at the airport, which will remain closed until at least 11 a.m. Thursday. Its main runway is the busiest in the nation.

Rescue teams totaling more than 300 people were searching the wreckage. It was located in approximately eight feet of water in the Potomac River. The teams were using boats and helicopters.

D.C. Mayor Muriel Bowser and other rescue officials would not disclose how many people died. However, Sen. Roger Marshall, R-Kan., said there were “many deaths.”