What we know so far
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Search and rescue boats have been deployed to the Potomac River
A passenger plane carrying 64 passengers and crew has crashed into a river in Washington DC after it collided in mid-air with a US Army helicopter.
Eighteen bodies have been pulled from the Potomac River so far, where search and rescue teams are scouring the waters in freezing temperatures, according to the BBC’s broadcast partner, CBS.
US authorities are investigating and the nearby Ronald Reagan Washington National Airport has grounded all flights.
Here is what we know so far about the incident:
What happened?
At around 21:00 local time (02:00 GMT) on Wednesday, a PSA Airlines jet operating as American Airlines 5432 collided with a US Army helicopter as it approached Ronald Reagan Washington National Airport, according to the Federal Aviation Administration.
The passenger plane, a Bombardier CRJ700, departed from Wichita, Kansas and was carrying 60 passengers and four crew, according to American Airlines.
The Pentagon said the helicopter involved was a Sikorsky H-60 that took off from Fort Belvoir in Virginia. Three US soldiers were on board, according to CBS.
The FAA said it would investigate the incident, together with the National Transportation Safety Board (NTSB).
Were there casualties?
There has been no official word on casualties. However, CBS reported that 18 bodies have been pulled from the water.
Early reports on US media said the passenger plane could be seen split in half on the Potomac River, while the helicopter was upside down in the water.
Police and fire department have been searching the water for survivors in freezing temperatures, with police boats assisting, CBS News reported.
The search and rescue could be seen from Ronald Reagan Airport, which is near the river.
What are eyewitnesses saying?
Ari Schulman told NBC Washington that he saw the plane crash while driving on the George Washington Parkway, which runs along the airport.
He said the plane’s approach looked normal, until he saw the aircraft bank hard to the right, with “streams of sparks” running underneath, illuminating its belly.
At that point, he said he knew that it looked “very, very wrong”. Having seen plane landings there in the past, he said a plane’s underside should not have been visible in the dark.
The sparks, he said, resembed a “giant roman candle” and went from the plane’s nose to its tail.
Jimmy Mazeo said he saw the crash while having dinner with his girlfriend at a park near the airport.
He recalled seeing what looked like a “white flare” in the sky. He said planes flying into Ronald Reagan Airport appeared to have been flying in “irregular patterns”.
Mr Mazeo said he did not think much of what he saw until emergency services started arriving at the scene.
What are US officials saying?
President Donald Trump said he had been fully briefed on the the “terrible accident” and that he was monitoring the situation closely.
“May God Bless their souls,” he said in a statement.
“Thank you for the incredible work being done by our first responders,” he said.
Vice-President JD Vance asked for prayers for those who were in the incident.
Defense Secretary Pete Hegseth and Transportation Secretary Sean Duffy, whose appointments were just recently confirmed, also said they were monitoring the situation.
American Airlines CEO Robert Isom expressed his “deep sorrow” about the collision in a video which has been posted to the airline’s website.