An American Airlines regional jet with around 60 passengers crashed in Washington D.C. Wednesday night following a collision with a military helicopter, according to officials. Here’s what we know so far.

Technology that would have allowed air traffic controllers to better track the movement of an Army helicopter was turned off at the time of the crash, Sen. Ted Cruz, R-Texas, said in an interview Thursday.

The U.S. Army helicopter that collided with an passenger jet near Washington, D.C., had an advanced surveillance system turned off.