DAMASCUS, May 5- Up to 20 people were killed Sunday when armed rebels fired at two towns in Syria's northern province of Aleppo, pro-government Sham FM radio said.The victims, including women and children, were killed when rebels fired Grad missiles and artillery shells at the pro- government towns of Nubbul and al-Zahara in the countryside of Aleppo, the report said.
Both towns are inhabited by people from Shiite minority, to whom the ruling elite in Syria belongs.
The attack came in the wake of some rebels' reports that the Syrian troops backed with paramilitary groups had killed tens of Sunni people during operations in the coastal city of Banyas.
Meanwhile, the Britain-based Syrian Observatory for Human Rights said violent clashes took place Sunday morning at the military airport of Menagh in Aleppo, while conflicts renewed in Aleppo's Khaldiya neighborhood with reports of losses on both sides.
