Pentagon official: 4 Americans killed in attack at U.S. base in Afghanistan

CNN Pentagon Correspondent

(CNN) — Four Americans were killed during a rocket attack at Bagram Air Base, outside of Kabul, a Pentagon official said Tuesday on the condition of anonymity.

The U.S.-led International Security Assistance Force confirmed that four NATO coalition service members had been killed in an attack but did not disclose the nationality of the casualties or the exact location of the attack.

The attack came as the NATO coalition handed over control for security in Afghanistan to Afghan forces.