Taliban gunmen opened fire on Afghan security guards in the country’s northern Parwan province, killing at least eight guards, a provincial official and the insurgents said on Tuesday.

Elsewhere in Afghanistan on Tuesday, four policemen were killed when their vehicle struck a roadside bomb around in southern Helmand province, a Taliban heartland. And in eastern Nangarhar province, where both the Taliban and an IS affiliate are active, a judge died in a bombing. The attack on the Afghan guards took place late on Monday night and also left two other guards wounded, according to the Parwan governor.

The guards were attacked while they were on their way to work at Bagram airfield, the main U.S. military base in Afghanistan.