Four U.S. service members have died in Afghanistan since the outrage turned violent . Four civilians are killed and 50 people are injured in Kunduz , a health official says . The Taliban claim responsibility for the attack on Saturday. The protests start after NATO troops burn Qurans at Bagram Airfield . Taliban says Saturday 's killing of two U.S. military officers is linked to burning .
Four civilians are killed and 50 people are injured in Kunduz , a health official says . The Taliban claim responsibility for the attack on Saturday. The protests start after NATO troops burn Qurans at Bagram Airfield . Taliban says Saturday 's killing of two U.S. military officers is linked to burning .