KABUL, Afghanistan (AP) — A vehicle driven by a suicide bomber exploded at the gate of a major U.S. military base in eastern Afghanistan on Wednesday, killing the attacker and three Afghans, Afghan police said. The Taliban claimed responsibility for the attack.

Police Gen. Abdul Qayum Baqizai said a local guard who questioned the vehicle driver at the gate of Camp Chapman was killed along with two civilians and the assailant. The camp is located adjacent to the airport of the capital of Khost province, which borders Pakistan. Chapman and nearby Camp Salerno had been frequently targeted by militants in the past, but violent incidents have decreased considerably in recent months.