After several hours of fighting, Afghan security forces killed five insurgents who shelled NATO headquarters at Kabul airport overnight with rockets and gunfire. The militants took cover in a five-story building under construction near the airport, forcing officials to halt flight operations. The Afghan police sealed off the building and cleared each floor while U.S. Black Hawk helicopters circled overhead. Two other insurgents were killed when they detonated their explosive devices, but there were no civilian or military casualties. Meanwhile, Afghan authorities were blaming the Taliban for beheading two boys in Kandahar. The Taliban denies any involvement in the killings.