Libyan rebels advance in Zawiyah

Fighting has continued to rage across Libya, with opposition forces closing in on Gaddafi's stronghold of Tripoli.<br /><br />Rebels say they now control most of the strategically important city of Az-Zawiyah.<br /><br />Gaddafi's army is using rockets to strike at opposition positions inside Az-Zawiyah. <br /><br />Al Jazeera's Zeina Khodr reports from Az-Zawiyah.