An Afghan policeman turned his rifle on his colleagues at a checkpoint in southern Helmand province, killing 11 of them before fleeing the scene, officials said on Tuesday.

The attack happened late on Monday night in Lashkar Gah, the provincial capital, said Omer Zwak, spokesperson for the provincial governor.

The attacker collected all the firearms and ammunition from his colleagues, then fled the scene in a police vehicle — presumably to join the Taliban. “An investigation is underway,” Zwak added.

Dr. Din Mohammad at the Lashkar Gah Hospital said the hospital morgue received 11 bodies of slain policemen, all with gunshot wounds.

The Taliban made no official statement about the attack but Afghanistan has seen several such incidents over the past years, cases in which Afghan troops or policemen — or Taliban militants dressed in Afghan uniforms — turn their guns on their colleagues or US-led coalition partners.