KABUL, Afghanistan — Taliban forces attacked a large coalition airfield in eastern Afghanistan early Sunday, detonating three car bombs near the entrance and engaging in a two-hour gun battle that killed nine insurgents, four Afghan guards and at least four civilians whose vehicle was caught in the cross-fire, Afghan officials and witnesses said.

Disguised in coalition military uniforms, the Taliban fighters attempted to enter the airfield, known as Forward Operating Base Fenty, after the initial explosions, which occurred just before 6 a.m., but were repelled by firepower that included helicopter gunships, officials said. Fewer than 10 coalition service members were wounded, according to official reports, though by late Sunday it remained unclear exactly how many had been hurt, and how severely. At least one of the guards killed in the fighting was a member of the Afghan military.