A NATO patrol shot at a vehicle and killed one civilian in southern Afghanistan, while an airstrike in the same region left three armed militants dead, officials said Thursday. The NATO patrol shot at the fast approaching vehicle in Kandahar province after its driver did not heed the soldiers' warnings to stop, the alliance said in a statement. "As a result, one civilian was killed and three were injured," the statement said. NATO said its troops followed its rules of engagement, shooting in self-defense at the car near Kandahar airfield, the main military base in the region. It also said the investigation into the incident was launched. Separately, an airstrike Wednesday north of Kandahar city, the capital of Kandahar province, left three armed militants dead, deputy provincial chief Amanullah Khan said.