Officials said on Wednesday they have positively identified all 67 people killed in last week's midair collision between an American Airlines passenger jet and a military helicopter over the Potomac River in Washington.

Washington, D.C. officials have now positively identified 66 of the 67 people killed in Wednesday's midair collision between an American Airlines passenger jet and a military helicopter over the Potomac River.

Investigators trying to figure out what led to the deadly midair collision between a US military Black Hawk helicopter and an American Airlines plane near Washington, DC, last week will brief lawmakers Thursday on what they’ve learned after combing through data from both aircraft and air traffic control.