Eight Nato soldiers and a foreign civilian contractor have been killed after a shootout in Kabul between an Afghan air force officer and his US military mentors. The incident, which happened at about 11am on Wednesday, is one of the worst episodes yet involving Afghan soldiers turning their weapons on their foreign colleagues. The Afghan defence ministry claimed the shooting broke out following an argument. However, a Taliban spokesman has claimed the officer was an insurgent who had infiltrated the force. The killings occurred in a management office responsible for overseeing air traffic control on the second floor of a building in the Kabul headquarters of Afghanistan's air force, where the officer had been working.