A provincial official says an insurgent attack on a fuel truck has killed six civilians in eastern Afghanistan.

The official, Abdul Wakil Atak, says the truck was hit by a rocket-propelled grenade fired by insurgents in Laghman province on Sunday. Atak is a spokesman for the provincial governor.

Atak said Monday that two people were killed inside the truck and that four others died in a minibus that was caught in the blast.

Insurgents regularly attack supply convoys for the U.S.-led coalition and NATO troops in Afghanistan. Hundreds of civilians have been killed in insurgency-related violence this year.