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CLARKSVILLE, Tenn. — Two pilots from Fort Campbell were killed Wednesday evening after their helicopter went down during a training mission.

WREG reported the the Apache AH 64 was from the 101st Airborne Division.

In an update Thursday, it was revealed only two people were on board at the time, but the names of those individuals have not been released.

Officials told WTVF, the investigation into what caused the deadly accident could take weeks, even months, to complete.