Eight civilians were killed and four injured in a roadside bomb explosion in southern Afghanistan on Monday, officials said.

“A tractor carrying villagers to Souri district struck the roadside bomb near Qalat city,” Sharifullah Naseri, government spokesman for Zabul province, said.

“Four of the dead were members of a single family,” he said. The Interior Ministry confirmed the incident, saying seven were killed in an “anti-vehicle mine” explosion.

It blamed the Taliban for the attack. Spokesmen for the insurgents were not immediately available for comment.