At least four people were killed early Saturday in an explosion inside the largest US military base in Afghanistan, NATO said, with the Taliban claiming responsibility for the major security breach.

The explosion struck at dawn inside the heavily fortified Bagram Airfield north of Kabul, as the Taliban step up attacks on Western targets before the onset of winter, when fighting usually ebbs.

The nationalities of those killed were not immediately known after the blast.

“An explosive device was detonated on Bagram Airfield resulting in multiple casualties. Four people have died in the attack and approximately 14 have been wounded,” NATO said in a statement. “Response teams at Bagram continue to treat the wounded and investigate the incident.”

Waheed Sediqi, spokesman for the governor of Parwan province where Bagram is located, said the blast was caused by a suicide attacker who blew himself up near a dining facility inside the base. “We don’t know the identity of victims yet, but the attacker was either one of the Afghan laborers working there,” Sediqi told AFP.

Source: AFP