Two US Army soldiers were killed in an Apache helicopter crash late Friday during routine training at Fort Campbell, Kentucky, the Army announced Saturday morning.

The two soldiers were members of the 101st Airborne Division’s 101st Combat Aviation Brigade. They were training in a AH-64E Apache helicopter.

Their names are being withheld by the Army until the families have been notified.

“This is a day of sadness for Fort Campbell and the 101st Airborne,” said Brig. Gen. Todd Royar, acting senior commander of the 101st Airborne Division and Fort Campbell. “Our thoughts and prayers are with the Families during this difficult time.”

The Apache crash follows a week of tragic military aviation accidents. Earlier this week, the military experienced three crashes in two days, with five deaths.

The Pentagon said Thursday that while the recent crashes are "not normal," the military is not considering it a "crisis."

"Certainly, that's not normal and our response to it is not normal," but "I'm not prepared to say right now that it is some kind of crisis," Marine Lt. Gen. Kenneth McKenzie, director of the Joint Staff, said at a Pentagon briefing Thursday.