Afghanistan's Defense Ministry said Saturday that a NATO airstrike in the western province of Badghis mistakenly hit a joint base housing coalition troops and Afghan security forces, killing four Afghan soldiers and three policemen. Defense Ministry spokesman Gen. Mohammad Zahir Azimi said an Afghan army commando unit, district police members and foreign forces were in the base in the Bala Marghab district at the time of the airstrike Friday afternoon. "During an air attack by NATO forces in Badghis province, seven Afghan troops were killed," the Defense Ministry said in a statement.