The death toll from fighting between forces loyal to Muammar Gaddafi and rebels controlling Misrata has risen to 31, a doctor at the Hekma hospital in the city has told Reuters news agency.
The doctor said over 110 people were also injured after battles between rebel fighters and loyalist forces on the edges of the city.
Gaddafi's forces also shelled the city, a rebel stronghold in western Libya.
The clashes come as Turkish Prime Minister Tayyip Erdogan has said his country offered a ‘guarantee’ to Libyan leader Muammar Gaddafi if he left Libya, but said Ankara had received no answer.
‘Gaddafi has no way out but to leave Libya, through the guarantees given to him, it seems,’ Mr Erdogan told NTV broadcaster in an interview.
‘We ourselves have offered him this guarantee, via the representatives we've sent. We told him we would help him to be sent wherever he wanted to be sent.
‘We would discuss the issue with our allies, according to the response we receive. Unfortunately we still haven't got a response from Gaddafi.’
Mr Erdogan, whose country is a member of NATO, did not specify what kind of guarantee his country had offered to Gaddafi.
Rebels said pro-Gaddafi forces had also shelled their positions in the Western Mountains region last night, and accused NATO of not doing enough to stop them.
‘They (Gaddafi forces) are shelling Zintan with Grad missiles,’ said rebel spokesman Abdulrahman, referring to a town 160km southwest of Tripoli.
Pressing ahead with a campaign to help end Gaddafi's rule, NATO warplanes hit a town west of the capital Tripoli despite unmet calls from the US and Britain for more allies to share the logistical burden of the bombing missions.
Russia, which has voiced misgivings over the use of foreign military force and has extensive commercial interests in Libya, wants to mediate reconciliation between Tripoli and the rebels.
The latter, struggling against Gaddafi's fighters, were promised more than $1.1bn in aid yesterday by Western and Arab powers convened in Abu Dhabi - donors also demanded details on how a post-Gaddafi government might work.
A second rebel spokesman, Juma Ibrahim, said the towns of Yafran and Nalut had also been struck and that Gaddafi's forces were massing near the Tunisian border to try to retake the Wazin crossing from the rebels.
A Reuters journalist in Tripoli heard a loud explosion in the capital just after midnight, but there were no further blasts later this morning.
Gaddafi troops and rebels have been deadlocked for weeks between the eastern towns of Ajdabiyah and the Gaddafi-held oil town of Brega.
Rebels also control the western city of Misrata and the range of Western Mountains near the Tunisia border.
At the United Nations, the prosecutor of the International Criminal Court said this week its investigators had found evidence linking Gaddafi to a policy of raping opponents.
The Libyan leader says the rebels are Islamist militants and foreign intervention is a front for a grab at the country's oil.
US Secretary of State Hillary Clinton, appearing at the Abu Dhabi meeting of the 22-nation Libya contact group, said talks were under way with people close to Gaddafi that had raised the ‘potential’ for a transition of power.
She did not elaborate on the discussions but said: ‘There is not any clear way forward yet.’
Despite the new aid pledges from France, Italy and Turkey, rebels voiced frustration at the pace of the intervention.
‘Our people are dying... So my message to our friends is that I hope they walk the walk,’ rebel Oil and Finance Minister Ali Tarhouni said.
