A U.S. military truck rolled over in a flash food in western Iraq's Anbar province, killing five U.S. Marines, injuring another and leaving three other troops missing, the military said Monday.

The military said it was "using all the resources available" to find the two Marines and a sailor who were missing following the Sunday accident.

The rollover of the seven-ton truck appeared to be an accident and was "not a result of enemy action," the military said.

No names were released.