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.

Crews continuing to search for debris from the deadly collision of a passenger jet and Army helicopter near Washington used a plane outfitted with lasers to scan the bottom of the Potomac River