An Afghan soldier thought to be an army trainer has shot dead two U.S. civilians and a fellow Afghan soldier during a weapons-training exercise at a military camp in northern Afghanistan.
NATO said in a statement that it was investigating with Afghan authorities whether it was a deliberate attack or an accident.
The gunman himself also died in the July 20 incident, in unclear circumstances.
A NATO soldier and an Afghan service member were also wounded at the training facility near Mazar-e Sharif, the largest city in the relatively peaceful north of the country.
compiled from agency reports