Divers are expected to return to the Potomac River as part of the recovery and investigation after the United States’ deadliest aviation disaster in almost a quarter century.

An American Airlines regional jet went down in the Potomac River near Ronald Reagan Washington National Airport.

Nearly 50 NTSB investigators will be searching the Potomac River for evidence to piece together what led to Wednesday night's deadly midair collision between an American Airlines regional jet and an Army Black Hawk helicopter.

A fter an American Airlines small eagle plane coming from Wichita, Kansas collided with a military helicopter midair before crashing into the Potomac River near D.C.'s Reagan Nati

As recovery operations continue after the midair collision between an American Airlines flight and an Army helicopter, NTSB investigators say they have recovered the two black boxes from the plane and have searched "all accessible areas" of the Potomac River.

Officials say the conditions of the Potomac River are complicating recovery efforts of the bodies of the 67 presumed dead in a mid-air collision between American Airlines flight 5342 from Wichita and a military Black Hawk helicopter.

A regional jet carrying 64 people collided with an Army Black Hawk helicopter. Reagan National Airport grounded all flights.

We are now at the point where we are switching from a rescue operation to a recovery operation,” said John Donnelly, the fire chief in the nation’s capital.

Residents and visitors were told to not touch or remove debris from the Potomac River, as the investigation into the midair D.C. plane crash remains ongoing.

Multiple 911 callers reported the crash near the river just before 8:55 p.m., according to the Metropolitan Police Department and the District of Columbia Fire and EMS.

The catastrophe immediately raised questions about the close proximity in which helicopters and jetliners soar over the busy skies of the nation’s capital.

Emergency teams will continue efforts to retrieve the bodies of those who died when a passenger jet and helicopter collided.