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A passenger plane carrying 60 people on a domestic flight crashed after a mid-air collision with a Black Hawk military helicopter near Washington’s Ronald Reagan National Airport, the White House and aviation officials said, prompting the suspension of all flights in the area.

At least 18 bodies were pulled from the Potomac River after a passenger plane collided with a helicopter near Ronald Reagan Airport in Washington, DC, a U.S. police official told CBS News on Thursday.

According to an informed source, the accident resulted in multiple fatalities, but the exact number of casualties remains unclear as rescue teams continue to search for any survivors. An army official said the helicopter was carrying three soldiers. There was no immediate information on the cause of the collision, while all takeoffs and landings at the airport were suspended as law enforcement helicopters flew over the site, according to the US Associated Press.

CNN reported that about 300 people are currently involved in search and rescue efforts.