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

Two Washington, D.C., airport employees have been arrested in connection with the leak of a video showing the moment Flight 5342 collided with a Black Hawk helicopter on Jan. 29.

Authorities say they have identified all but one of the victims of the deadly collision that happened on January 29.

There were 64 passengers aboard the plane, and three Army soldiers in the helicopter, according to officials. Here's a look at what we know about the victims.