NATO warplanes are backing up Libyan fighters who are trying to capture Muammar Gaddafi's home city of Sirte. <br /><br />For a few hours on Saturday - anti Gaddafi forces were within touching distance of the city centre.<br /><br />But they were driven back by heavy fire from snipers, mortars and artillery. <br /><br />Zeina Khodr reports from outside Sirte.
