Syria's army said it had completed a "security sweep" on Saturday of a neighbourhood in Aleppo where it clashed with Kurdish forces, who denied losing control of the area after defying calls to surrender.Government forces began striking the Sheikh Maqsud district overnight after a deadline elapsed for Kurdish fighters to withdraw during a ceasefire.AFP correspondents in Aleppo reported that gunfire in the area -- the city's last district still in Kurdish hands -- continued into the morning.