Fighting between Muammar Gaddafi's forces and Libyan insurgents has raged across western Libya, with casualties reported in Zintan and Zawiya as rebels went on the offensive. Battles were also being fought in the Berber mountains, south-west of Tripoli in nearby Yafran, and at Dafnia near Misrata, Libya's third city. Tribal fighters opposed to Mr Gaddafi have also clashed with his forces in the oasis city of Sabha – a first since the outbreak of an uprising against him in mid-February.