Qatari Prime Minister Hamed bin Jassem will also take part in the meeting in the British capital, Downing Street said in a statement Saturday after Cameron spoke by telephone with both men.

"In the calls, Prime Minister Cameron said that he hoped the conference would bring together a broad grouping of countries committed to a better future for the people of Libya," it said.

It said Cameron also wanted the conference to send an "unequivocal message" that the international community would continue to implement the UN Security Council resolution on Libya.

The delegates would also discuss plans for "meeting the humanitarian needs of the Libyan people," the statement added.

Cameron thanked the Qatari leader after the country became the first Arab state to deploy warplanes to enforce a no-fly zone mandated by the resolution, it said.

Britain has invited its NATO allies, the Arab League, African Union and regional countries to the conference and US Secretary of State Hillary Clinton has already said she will attend.

The meeting comes against a backdrop of continuing uncertainty over the coalition's aims and command structure, with NATO set to take command of its military operations from the United States.

British Foreign Secretary William Hague said earlier this week that the participants would form a "contact group of nations" to advance efforts to stop Moamer Qadhafi's forces killing civilians.