members of NATO
members of NATOReuters

Four NATO troops were killed Sunday in an insider attack “suspected to involve members of the Afghan police” in southern Afghanistan, officials said.

No further details have been provided.

At least 51 foreign military personnel have been killed in a series of insider attacks across Afghanistan in recent months.

The incident came a day after two NATO soldiers were shot dead by insurgents disguised in U.S. Army uniforms in the southern Helmand province, one of the strongholds of the Taliban-led insurgency.

The international coalition gave no indication how the insurgents obtained U.S. Army uniforms.

The attackers were armed with automatic rifles, rocket propelled grenade launchers and suicide vests. According to NATO, they were organized into three teams and “executed a well-coordinated attack” against the airfield on Camp Bastion in the southern province, where Britain’s Prince Harry is stationed.

The alliance say the attackers destroyed six Harrier jets and “significantly damaged” two more. They also destroyed three coalition refueling stations and damaged six aircraft hangars.

The Taliban has claimed responsibility for the attack.