An American Airlines plane and a U.S. Army helicopter collided near Reagan National Airport and crashed into the Potomac River, according to officials.

The number of people onboard and any fatalities is unknown at this time. The plane can carry up to 65 passengers and four crew members.

In a video statement, American Airlines CEO Robert Isom said he would be traveling to Washington D.C. to oversee the airline’s response to the collision between an American regional jet and a military helicopter.