Colonel Muammar Gaddafi’s forces have clashed with rebels despite a UN-backed no-fly zone aimed at stopping the violence.
Gaddafi loyalists have repelled rebel advances in the oil-producing town of Ajdabiyah, just south of the insurgents’ stronghold of Benghazi.
Anti aircraft fire has continued to ring out in Tripoli, while residents of Yafran said at least nine people had been killed in clashes between the two sides.
Gaddafi’s forces have also struck the rebel-held enclave of Misrata, east of the capital, where four children were killed on Tuesday.
A rebel spokesman told AFP that Gaddafi’s men opened fire with tanks and set up sniper positions to gun down people in the streets.
Security analysts say the rebels are disorganised and unable to match the Libyan leader’s military might, perhaps explaining why they have struggled to makes further advances, including the taking of Tripoli.