KABUL, Afghanistan, June 19 (UPI) -- Four Americans were killed in a rocket attack at Bagram Air Base outside Kabul, Afghanistan, a Pentagon source said.
The official, who spoke on condition of anonymity, told CNN Tuesday the four NATO coalition members killed in the attack were all Americans.
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The U.S.-led International Security Assistance Force confirmed the attack on Bagram but identified the victims only as "NATO coalition service members."
The Taliban issued a statement claiming responsibility for the attack.
News of the casualties came as NATO-led troops transferred security responsibility to Afghan forces.