The U.S. Navy is still notifying family of three crew members who died in the crash of a plane from Naval Air Station Whidbey Island on a training flight in Eastern Washington.

Commander Kevin Stephens says the names of the three crew members will not be released until 24 hours after their family members have been notified.

The E/A-6B Prowler crashed on Monday morning in a farm field about 50 miles west of Spokane. Photos of the crater show the plane apparently disintegrated on impact, killing everyone aboard.

The Navy says the plane was engaged in low-level training exercises when the crash occurred. The cause is under investigation, a process that Stephens says will probably take weeks to complete.