WASHINGTON (Reuters) - A CIA officer and a U.S. Army intelligence analyst were among those killed in a suicide bomb attack last weekend in Afghanistan, U.S. officials said on Wednesday, speaking on condition of anonymity.

The attack on Saturday in Kandahar province also killed several Afghans. The NATO-led force has yet to determine whether it was the result of a insider attack, in which Afghan forces - including Taliban infiltrators - turn their weapons on allies.

An investigation is ongoing.

The U.S. military has only identified one of the dead Americans as Specialist Brittany Gordon, a 24-year-old intelligence analyst. The identity of the second American has not been publicly released.

However, two U.S. officials told Reuters the other slain American was a CIA officer. A third U.S. official said only that he was "one of many civilians in Afghanistan who bravely serve alongside our Armed Forces."

The CIA declined comment.

(Reporting by Phil Stewart; Editing by Sandra Maler)