Rebel rocket fire killed at least 11 people and wounded others in Syria's southern city of Daraa on Wednesday.The rockets were launched by the al-Qaida-linked Nusra Front and slammed into government-controlled districts of Daraa, Xinhua cited SANA news agency as saying.The attack came a week after the Syrian army, backed by allied fighters of the Lebanese Hezbollah, captured the key town of Sheikh Miskeen in the countryside of Daraa.The contested city, which has seen previous battles between the rebels and the Syrian army, constitutes a supply line for the rebels who are operating in Daraa, the birthplace of Syria's nearly five years of conflict.