The incident involving an AH-64E Apache helicopter occurred late Friday, said a statement from the army's 101st Airborne Division. The crash is under investigation.

The names of the victims are being withheld pending notification of family members, the army said. There were no other casualties.

"This is a day of sadness for Fort Campbell and the 101st Airborne," Brigadier General Todd Royar, acting senior commander of the 101st Airborne and of Fort Campbell, said in a statement.

The deaths were the latest in a recent rash of military crashes that has claimed five other lives and left one man injured.

Four Marines died Tuesday in the crash of their Sikorsky CH-53E Super Stallion helicopter during a practice landing in El Centro, California.

A member of the air force's elite Thunderbird squad died Wednesday when his F-16 jet crashed near Nellis Air Force Base outside Las Vegas as he prepared for an air show.

And a Marine pilot was injured Tuesday after ejecting from his McDonnell Douglas AV-8B Harrier II attack jet while taking off from an airport in Djibouti, in the Horn of Africa.