KANDAHAR (Agencies) Two US troops and at least 11 civilians, including women and children, died in violence across southern Afghanistan on Friday. A roadside bomb ripped through a mini bus in Kandahar on Friday, killing nine civilians, including women and children, a provincial spokesman told AFP. The vehicle struck the bomb on the main highway in Maywand district of the province after leaving neighbouring Helmand, Zalmai Ayobi, Kandahar provincial spokesman, told AFP. Nine civilians were killed and eight others were wounded, Ayobi said. Five of the wounded were in critical condition and were airlifted by Nato forces to a military hospital. Three other injured were taken to a local Kandahar hospital, he said. Among the dead were four women, three children and two men, Ayobi said. In neighbouring Zabul province, a suicide bomber dressed in a burqa detonated his cache of explosives in a shopping area in Shahjoy district, killing two civilians and wounding at least 16 others, said Mohammad Jan Rasoolyar, a spokesman for the provincial governor. Nato said two American service members died in an explosion in southern Afghanistan on Friday but did not disclose details or the location because relatives had not yet been notified. At least 33 troops serving with the international coalition have been killed so far this month, 23 of them American. Also on Friday, the Taliban claimed responsibility for a rocket attack on Bagram Air Field north of Kabul. Nato confirmed that a rocket landed in a field inside the base but did not cause any injuries or damage. Nato said a second rocket landed outside the base.