Officials said two commercial flights approaching Ronald Reagan National Airport were ordered to "dopt" due to an Army helicopter.

US Department of Transportation Secretary Sean Duffy said Friday he would ask the Pentagon for answers to the Blackhawk helicopter flight that forced Delta and Republic Airlines planes to abandon landings.

"It's not acceptable. We have clear helicopter restrictions on DCA," Duffy wrote on X.

No one was injured in the incident, which occurred around 2:30 pm

U.S. Army spokesman Captain Victoria Goldfedib said the UH-60 Blackhawk helicopter "in accordance with published FAA flight routes and DCA air traffic control," told it in the Pentagon air traffic control that "flight operations are carried out in the Pentagon under the published FAA flight routes and DCA air traffic control."

Goldfedib said the two commercial flights were told to be around instead of land to ensure there was no conflict in the airspace.

"The incident is currently under investigation. The U.S. Army remains committed to conducting aviation safety and conducting flight operations in all approved guidelines and procedures," she said.

The National Transportation Safety Commission and the Federal Aviation Administration said they are investigating the incident.

The helicopter had no passengers, but both pilots and a captain were on board, two U.S. officials said. Two officials told NBC that it flew below 200 feet while rehearsing the joint emergency evacuation program, which is part of the return flight training operation.

According to FAA rules, helicopters are not generally allowed to fly over 200 feet near Reagan.

On January 29, a commercial aircraft of the American Eagle and a Black Hawk helicopter collided in the air above the Potomac River near the airport, killing 64 people on the plane, three people on the helicopter.

The crash raised questions about the crowded airspace around Ronald Reagan National Airport, located near Washington, Arlington, Virginia.

In this case, investigators have evidence that the helicopter involved in the air collision is above the ceiling of 200 feet.

The NTSB has said it hopes to severely limit helicopter traffic near the airport, believing that “the risk of aviation safety is unbearable.”