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.

More than a week after the horrific helicopter-plane collision near Washington, salvage crews have recovered most of the wreckage.