New Delhi, Feb. 1 -- A tragic midair collision between an American Airlines passenger jet and a US Army helicopter near Washington D.C.'s Reagan National Airport on Wednesday night has claimed the lives of all 67 people on board. The incident, which sent both aircraft crashing into the Potomac River, marks the deadliest air disaster in the US in more than two decades. As investigators work to determine the cause, recovery efforts are ongoing, and authorities are piecing together the final moments leading up to the crash. Here's what we know so far.

By Friday afternoon, recovery teams had retrieved 41 bodies, with 28 positively identified. Authorities have informed 18 families about their loved ones' deaths. Search efforts are ongoing to ...