A media briefing is scheduled to begin early Thursday from the Reagan National Airport when an American Airlines regional passenger jet and a U.S. Army Black Hawk helicopter crashed into the Potomac River after a mid-air collision on Wednesday night, the officials said.

American Airlines confirmed that 64 people were aboard the jet: 60 passengers and four crew members. Three soldiers were aboard the helicopter, a U.S. official said.

Rescue crews and fireboats were immediately sent to find survivors of the crash in the river, the D.C. Fire and EMS Department confirmed on X shortly after 9 p.m. Authorities have not yet released any initial estimates of injuries or deaths.

The plane involved was flight 5342 on American Airlines, which had departed from Wichita, Kansas, according to the Federal Aviation Administration.

"We're cooperating with the National Transportation Safety Board in its investigation and will continue to provide all the information we can," American Airlines CEO Robert Isom said in a video statement.

Both the FAA and the National Transportation Safety Board are investigating the cause of the crash, according to the aviation agency's statement obtained by USA TODAY. President Donald Trump is monitoring the response to the situation which he called a "terrible accident."

A media briefing is scheduled to begin at 12:45 a.m. ET from the Reagan National Airport.

Airport officials confirmed all takeoffs and landings have been halted as the DCA airport remains closed until at least 5 a.m. Thursday.

Reuters contributed to the reporting of this developing story.

This article originally appeared on USA TODAY: Authorities address plane with over 60 onboard crash in DC: Watch live