A U.S. military helicopter crashed in Fort Hood on Monday, killing all four of its crew members, army officials said. The UH-60 Black Hawk helicopter crashed some time after 5:49 p.m. in the northeast section of the major Texas military post, a statement from the Fort Hood public affairs office revealed, according to the Associated Press.

Emergency crews conducted a search of the crash that ended with the discovery of the four deceased crew members.

The Fort Hood statement did not formally identify the crash victims beyond saying that the crew had been assigned to Division West, First Army.

"The crew was assigned to Division West, First Army. They were on a routine training mission at the time of the crash," the statement reads in part.

The cause of the crash is unknown, and officials said a board will be assigned to investigate the crash, according to ABC Texas affiliate WFAA-TV.

The names of the victims will not be released until 24 hours after the next of kin are notified.

Located in Killeen, between Dallas and San Antonio, Fort Hood is one of the Army's largest bases, with a population of about 218,000, including active-duty personnel and their family members. It houses the 1st Cavalry Division and the West Division of the First Army as well as the Headquarters Command III Corps, 3rd Armored Cavalry Regiment and 3rd Air Support Operations Group.