KABUL (Agencies) - Two suicide bombers dressed as policemen killed 12 officers in a brazen attack on police headquarters in east Afghanistan on Saturday. Overnight, Afghan and NATO-led forces killed more than 15 insurgents after they came under fire when they approached a compound in Na-ngarhar province near the border with Pakistan. In the Paktia provincial capital of Sharan, Taliban insurgents dressed in police unifor-ms attacked the police chiefs headquarters and a training centre, a local official said. Two of the attackers detonated explosives-packed vests they were wearing once they got inside the compound, killing 12 police. Taliban claimed responsibility of the attack.