Sixty passengers and four crew members from the plane and three Black Hawk helicopter personnel are feared dead as a recovery mission is underway.

A jet with 60 passengers and four crew members collided with an Army helicopter while approaching Ronald Reagan National Airport near Washington, D.C., sending the two aircraft plummeting into the Potomac River. Everyone on board the two aircraft is feared dead, officials said Thursday.

DALLAS — Investigators from the National Transportation Safety Board will likely be studying three main elements as they try to pinpoint the cause of the mid-air collision between American Airlines Flight 5342 and the U.S. Army helicopter on Wednesday night.