WATCH: NTSB holds news conference on aircraft collision in Washington, D.C.

A midair collision between an Army helicopter and an American Airlines flight from Kansas killed all 67 people aboard the two aircraft, officials said Thursday, as they scrutinized the actions of the military pilot after the country’s worst aviation disaster in a generation.

Watch the NTSB’s news briefing on the collision in the player above.

At least 28 bodies were pulled from the icy waters of the Potomac River after the helicopter apparently flew into the path of the jet late Wednesday while it was landing at Ronald Reagan National Airport near Washington, officials said. The plane carried 60 passengers and four crew. Three soldiers were aboard the helicopter.

LIVE UPDATES: Jet and helicopter collide at D.C. airport

National Transportation Safety Board Chair Jennifer Homendy said Thursday at a press conference that “we look at facts on our investigation and that will take some time.”

She was responding to a question on speculation about the cause of the crash between the an American Airlines jet and Army helicopter late Wednesday just outside Washington, D.C.

At a press conference earlier Thursday, Trump suggested without any evidence that the Federal Aviation Administration’s diversity efforts had made air travel less safe.

The president asserted his opinion even though the crash has yet to be fully investigated and there has been no determination as to whether the FAA did anything wrong.

Homendy also said the black boxes from the aircraft have not been recovered yet.