The Army has identified the three crew members who died Wednesday when their Black Hawk helicopter collided with a passenger jet over the Potomac River near Reagan Washington National Airport, killing all 67 people aboard both aircraft.

The crew of an Army Black Hawk helicopter might not have heard key instructions from air traffic control before a collision with a passenger jet over the Potomac River on Jan. 29, the National Transportation Safety Board said Friday in its most detailed account of the moments before the crash that killed 67 people.