Tripoli/London, March 29: Mounting pressure on Muammar Gaddafi's to quit, world leaders today vowed to intensify air strikes to stop his "murderous attacks" on civilians as Libyan forces struck back at rebels advancing towards his hometown of Sirte, forcing them to retreat.
At a London conference on Libya, leaders from about 40 countries also agreed to established a contact group, chaired by Qatar, to co-ordinate support for the country. Delegates at the conference agreed that Col Gaddafi and his regime had "completely lost legitimacy and will be held accountable for their actions", BBC reported. They said the allied air strikes would continue until Gaddafi "stops his murderous attacks."
Clinton told the conference that coalition military strikes would continue until Muammar Gaddafi, the Libyan leader, fully complies with UN demands to end violence against civilians.
She said no decision had been made on arming the rebels but that under the UN resolution there could be a "legitimate transfer of arms if a country were to choose to do that".
She said the international community would work to boost pressure on and isolate his government to "make clear to Gaddafi that he must go."
Meanwhile, using rockets and tanks, Gaddafi's forces pushed back the rebels closing in on Sirte even as coalition forces pounded his arsenal.
Al Jazeera said Gaddafi's forces shelled the pro-democracy forces heading west on the main coastal highway.
The rebels were pushed out of Bin Jawad, about 150 km east of Sirte, the Arab channel said but there was no independent corroboration.
Reports reaching here also said that Gaddafi's troops attacked the rebel-held Misurata, 214 east of Tripoli, forcing the outgunned rebels to fall back.
Libyan army officials claimed that their forces had recaptured and liberated Misurata and declared a ceasefire on the western front. However, rebel sources said street fighting was on in the centre of the town.
Helped by heavy strikes by coalition forces, the rebels were reported to have regrouped in Harawa, 60 km from Sirte to capture the town of Nawfaliyah as the uprising against Gaddafi's 41-year-old rule entered the sixth week.
Rebels used mortars and heavy machine guns to smash through Government forces, defences at Nawfaliyah but were meeting stiff resistance from Gaddafi's troops, the Arab channel said.
Bombardments of the road between Bin Jawad and Nawfaliyah sent the rebels fleeing, BBC reported.
NATO and US warplanes pounded tanks and heavy guns of Gaddafi's forces. For the first time, US media reports said Americans used the AC-130S and A-10 attack aircraft to carpet bomb government troops.
The aircraft which fly low and slow over the battle field were deployed only after a week of allied airstrikes, which decimated Gaddafi's airforce.
These aircraft armed with heavy machine guns and cannons raked the ground to flush out dug-in troops and convoys in closer proximity to civilians. The planes have been deployed to step up pressure on Libyan ground forces.
UN Secretary General Ban Ki-moon, EU and NATO leaders, Arab League and leaders from African Union joined the talks to ratchet up pressure on Gaddafi and to chalk out an agreement on Libya's future.
Ahead of the meeting, President Barack Obama vigorously defended American military intervention in Libya, saying failure to act would have carried a far "greater price" for the US and also led to a "slaughter" of civilians in the north African nation.
Noting that the US has an important "strategic interest" in preventing Gaddafi from overrunning those who oppose him, Obama also declared, "we have stopped Gaddafi's deadly advance."
At the same time, Obama in his first address to the nation since launching cruise missiles and airstrikes 10 days ago ruled out targeting Gaddafi citing the Iraqi experience, warning that trying to oust him militarily would be a costly mistake.
Britain formally recognised Libya's rebel leadership as the country's legitimate government, becoming the third country after France and Qatar to take this step.
Cameron and French President Nicolas Sarkozy issued a joint statement supporting the interim National Transitional Council.
The statement came as a Downing Street spokesman confirmed diplomats had made contact with the council.
British foreign Secretary William Hague said he wanted Gaddafi to leave power and face trial at the International Criminal Court.
Italian Foreign Minister Franco Frattini said several countries planned to put forward a deal which would propose a ceasefire, exile for Gaddafi and a framework for talks between Libya's tribal leaders and opposition figures on the country's future.
As the international leaders started assembling in London, Gaddafi in a letter addressed to them called for an end to what he called as "barbaric offensive" against Libya, likening it to Hitler's invasion of Europe and bombing of Britain in the World War-II.
"Stop your barbaric, unjust offensive on Libya. Leave Libya to Libyans", Gaddafi said in a letter to the leaders meeting in London, a copy of which was released by official Jana news agency. Gaddafi in his letter said he will "accept any decision taken by the African Union".
"How could you attack those who are fighting al Qaeda", he asked.
The London conference, hosted by the British Foreign Secretary, included representatives of about 40 countries and international organisations, including UN Secretary General, African Union chairman Jean Ping, Qatari Prime Minister, foreign ministers from Iraq, Jordan, UAE and Morocco besides Clinton and foreign ministers from across Europe.
The Arab League, Lebanon and Tunisia will also be represented. Russia will not be represented, as its leaders have protested at what they see as an abandonment of the UN resolution in favour of a move towards formal regime change. PTI