WASHINGTON, D.C. (7News) — Recovery crews are set to use a massive crane Monday morning to lift wreckage from the Potomac River, days after a tragic midair collision between a plane and a helicopter left dozens dead.

Authorities have now identified 55 of the 67 victims, as efforts continue to locate remaining American Airlines passengers. All crew members from the U.S. Army Black Hawk helicopter have been identified and located.

RELATED | 67 crosses placed at DCA tragedy vigil site while crews wait for more recovery equipment

Officials said the crane, previously used in the Francis Scott Key Bridge collapse in Baltimore, will be critical in cutting and lifting sections of the aircraft to allow crews to safely recover any additional remains.

Divers are still searching for the bodies of 12 victims, according to D.C. Fire and EMS Chief John Donnelly.

Crews have been working along the river, where debris continues to be carried downstream. Officials urge the public to report anything they find along the shoreline and to not touch it.

Investigators with the National Transportation Safety Board (NTSB) continue to investigate the cause of the Jan. 29 collision along with the Federal Aviation Administration (FAA).

RELATED | NTSB releases timeline of DC plane crash from recovered black box recorders

A few minutes before the jet was to land, air traffic controllers asked American Airlines Flight 5342 if it could do so on a shorter runway, and the pilots agreed. Controllers cleared the jet to land and flight tracking sites showed the plane adjust its approach to the new runway, according to the Associated Press.

Less than 30 seconds before the collision, an air traffic controller asked a helicopter if it had the arriving plane in sight. The controller made another radio call to the helicopter moments later, saying “PAT 25 pass behind the CRJ" — apparently telling the copter to wait for the Bombardier CRJ-701 twin-engine jet to pass. There was no reply, and the aircraft collided seconds later, the Associated Press added.

The NTSB reported that preliminary data from the investigation revealed conflicting altitude readings between the two aircraft. According to the NTSB, the jet's flight recorder indicated an altitude of 325 feet, with a margin of error of 25 feet. However, data from the control tower showed the Black Hawk at 200 feet, which is the maximum allowed altitude for helicopters in the area.

Additionally, the black box recorders from the aircraft indicated a change in pitch just one second before the impact.

U.S. Secretary of Transportation Sean Duffy said the plane was found upside down and in three different sections.

RELATED | Friends say Army captain killed in midair collision was a 'brilliant and fearless' patriot

Photos captured of the wreckage site show pieces of the plane's wing among scattered debris as emergency crews look toward the water.

American Airlines shared phone numbers for families of victims of the crash: 800-679-8215 or on their website.