International

A U.S. Army Apache attack helicopter crashed in the predawn hours early Saturday while flying a routine training mission at the National Training Center in Fort Irwin, California.

Both the pilot and the co-pilot were killed, according to Lt. Col. Jason S. Brown, a spokesman for the Army at the Pentagon.

"The cause is currently under investigation and next-of-kin notifications are ongoing, therefore we can provide no further details at this time," he said in a statement to Fox News.

The Apache gunship was flying a "readiness training exercise" at the time of the crash, according to a separate official.