people are believed to have died in the accident marking one of the deadliest aviation accidents in recent history.

Staffing in the air traffic control tower was "not normal" at time of the midair collision between an American Airlines passenger jet and an Army helicopter near Washington, D.C., according to a report by the Federal Aviation Administration.

A midair collision between an Army helicopter and a jetliner killed all 67 people aboard the two aircraft, officials said Thursday, as they scrutinized the actions of the military pilot in the country’s deadliest aviation disaster in almost a quarter century.