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.

The wreckage of a military helicopter involved in a mid-air collision with a passenger jet that killed all 67 people on both aircraft was recovered Thursday from the Potomac River, federal officials said.