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.

Footage shows the wreckage of the Black Hawk helicopter that crashed into a plane floating in the Potomac River. Video captured by the National Transportation Safety Board (NTSB) shows the devastating aftermath of a mid-air collision between an American Airlines Bombardier CRJ-700 and a U.