Investigators searching for wreckage from last week’s deadly midair collision between a US military Black Hawk helicopter and an American Airlines plane near Washington, DC, conducted an overnight scan of the Potomac River where the aircraft fell using advanced imaging technology to map the riverbed and locate debris.

Salvage crews have been working to recover the wreckage of the American Airlines jet and the Black Hawk helicopter.

American Airlines aircraft and US Army helicopter collided in mid-air in Washington DC. Investigators recovered all of the victims in the Potomac River