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

American Airlines passenger jet near Ronald Reagan Washington National Airport near Washington, D.C. The jet, which was flying from Wichita, Kansas, carried 64 people, while the helicopter had three people on board.

The National Transportation Safety Administration says the Army Black Hawk helicopter that collided with an American Airlines jet over the Potomac River last Wednesday was flying at about 300 feet at the time of the collision,

A regional jet carrying 64 people collided with an Army Black Hawk helicopter. Reagan National Airport grounded all flights.

WASHINGTON — Officials said that all on board the American Airlines flight from Wichita, Kansas, and a U.S. Army Black Hawk helicopter from Fort Belvoir army base were killed when the helicopter collided on Jan. 29.

In the deadliest U.S. major commercial aviation incident in 16 years, there were no survivors in a collision between a commercial aircraft and an Army helicopter by Ronald Reagan National Airport near Washington D.

Officials have begun identifying victims of a deadly midair collision between an American Airlines plane and a U.S. Army helicopter

The National Transportation Safety Board said the air traffic controllers’ screens showed that the Black Hawk helicopter was flying at about 300 feet. The ceiling for helicopters in that area is 200 feet.