'Insider' killer foiled by Diggers AUSTRALIAN soldiers' quick reaction has prevented yet another series of "insider" killings in Afghanistan by a rogue member of the Afghan army. The Diggers were part of a detachment guarding Australian, British and New Zealand instructors based at the new officer training school near Kabul, on Saturday morning. The party was leaving an Afghan National Army compound in the Qargha region of northern Afghanistan, with other Australian soldiers and one from New Zealand, when they were fired on by an Afghan soldier. Members of the group returned fire and wounded the Afghan. He was taken to hospital but died of his wounds. One Australian was slightly wounded by splinters and a New Zealander was shot in an ankle. Acting Chief of the Defence Force Air Marshal Mark Binskin said the Australians' prompt response had potentially saved coalition and Afghan personnel. "It is impossible to completely remove the threat of insider attacks, but the actions of the ADF force-protection soldiers demonstrate that our training and force-protection techniques are appropriate," he said. Air Marshal Binskin said the Australian soldier had returned to duty and the New Zealander was in a stable condition. Australian and New Zealand investigators have begun talks with the dead Afghan soldier's unit in a bid to find out why he carried out the attack. When most of the 1600 Australians in Afghanistan come home shortly, a team of Australian instructors will remain at the Afghan National Army Officer Academy, known variously by British and Australian officers as Sandhurst in the Sand or Duntroon in the Dirt. They will be guarded by an additional Australian force-protection group. Security has been tightened after "green-on-blue" incidents and so-called "guardian angels" now remain on guard and armed whenever Australian and Afghan troops are together.