DC plane crash updates: Remains of 55 victims recovered and positively identified

Divers and boats are searching the dark, frigid waters of the Potomac River hours after a Black Hawk helicopter collided with a jet approaching Reagan National Airport and both aircraft crashed into the water.

Officials did not provide an update on whether anyone had been pulled from the water or taken to the hospital during an early morning news conference about 1 a.m. Thursday.

D.C. Fire and Emergency Medical Services Department Chief John Donnelly said the search-and-rescue effort would continue through the night in very difficult conditions.

"The conditions out there are extremely rough," Donnelly said. "It's cold. They're dealing with relatively windy conditions."

A regional American Airlines jet and a Black Hawk military helicopter collided over Washington, D.C., Wednesday night in the first major commercial airline crash since 2009.

Three emergency care providers in the Washington, D.C., region have confirmed with ABC News that they have not yet received any patients from the crash.

Inova Fairfax said its "hospitals are prepared to care for any patients from the tragic incident at DCA" just before midnight on Wednesday. "Our hearts are with all those affected," the medical provider also said in its statement to ABC News.

"At this time, we have not received any patients," VHC Health, formerly the Virginia Hospital Center, said in a statement at midnight on Wednesday.

"The crash at Ronald Reagan Washington National Airport is a sad and shocking tragedy and our thoughts are with all those impacted by this incident. We are working directly with the Arlington and Metropolitan Police Department, Fire, and EMS teams and all authorities," VHC Health said, adding, "VHC Health is prepared to assist and support first responders as these agencies continue their emergency response."

"We did not receive anyone from the plane collision," a representative from MedStar Health confirmed with ABC News.

-ABC News' Youri Benadjaoud and Eric Strauss

American Airlines CEO Robert Isom released a video statement about the crash of Flight 5342 over the Potomac River on Wednesday night as it approached Reagan National Airport.

"First and most importantly I'd like to express our deep sorrow about these events," Isom said.

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He said the airline is fully cooperating with the National Transportation Safety Board and working with federal, state and local authorities on the response to the crash. The airline is sending a "go team" to D.C. and Isom said he will join them shortly.

"We want to learn everything we can about today's events," Isom said. "That work will take time."