US President Barack Obama has said Libyan government forces must end their offensive against rebel-held towns and pull back - or face military action.
He said the terms of a UN Security Council resolution backing action to defend civilians were "not negotiable".Col Muammar Gaddafi's government has declared a unilateral ceasefire, as attack plans are drawn up against him under the UN resolution.
There are reports government offensives are continuing despite the ceasefire.
Libyan officials have dismissed these as untrue and say international observers are being invited to Libya to verify the situation.
In the rebel-held western city of Misrata, which is surrounded by government forces, residents there told Reuters news agency that there was no sign of a ceasefire and that the city continued to be pounded by bombs and artillery.
And Arabic TV station al-Jazeera reported that pro-Gaddafi forces were advancing quickly towards the eastern rebel stronghold of Benghazi on Friday evening. Its correspondent reported that loyalist forces were clashing with rebels in the towns of al-Magroun and Slouq, about 50km (30 miles) from the city.
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“Start Quote
End QuoteThere was a recurring rhythm to President Barack Obama's speech... But it wasn't a drum beat of war - it was a chorus about consensus, an insistence on internationalism”
The city of Zawiya has already fallen to pro-Gaddafi forces, while there has been fierce fighting in and around Ajdabiya in recent days.
Mr Obama said: "All attacks against civilians must stop. Gaddafi must stop his troops from advancing on Benghazi, pull them back from Ajdabiya, Misrata and Zawiya, and establish water, electricity and gas supplies to all areas."Humanitarian assistance must be allowed to reach the people of Libya.
"Let me be clear, these terms are not negotiable. If Gaddafi does not comply, the international community will impose consequences, and the resolution will be enforced through military action.
"Our goal is focused, our cause is just and our coalition is strong."
The US ambassador to the UN, Susan Rice, told CNN that Col Gaddafi was in violation of the UN Security Council resolution, adopted on Thursday, which called for an immediate ceasefire and banned all flights over Libya.
But Libya's Deputy Foreign Minister, Khaled Kaim, said on Friday evening that Libyan government forces had conducted no military operations since announcing the ceasefire earlier.
"We have had no bombardment of any kind since the ceasefire was declared," he told reporters when asked about reports of continued government operations in Misrata and other parts of the country.
'Actions not words' US Secretary of State Hillary Clinton is travelling to Paris on Saturday to join allies in discussing the next steps in Libya.
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The rebels' clear expectation now is that British, French or American bombardment will contribute to a speedy and complete defeat for Muammar Gaddafi and he will swiftly be forced from office.
But there is an uneasy recognition of a more difficult possible outcome too.
If UN intervention stops pro-Gaddafi forces in their tracks but does not then destroy them, it may preserve the temporary partition of Libya between government and rebel-controlled sectors.
Analysis
But there is an uneasy recognition of a more difficult possible outcome too.
If UN intervention stops pro-Gaddafi forces in their tracks but does not then destroy them, it may preserve the temporary partition of Libya between government and rebel-controlled sectors.
The British and French, along with some Arab allies, are expected to play a leading role in any initial air strikes.
French Foreign Minister Alain Juppe said everything was ready to launch military strikes in Libya.The French ambassador to the UN, Gerard Araud, told the BBC he expected military intervention in Libya within hours of the Paris summit.
British Prime Minister David Cameron said Col Gaddafi would be judged by "actions, not his words", and that British Tornado and Typhoon aircraft were being moved to bases in the region.
The commander in charge of planning for the no-fly zone will be US Adm Samuel Locklear, the BBC's Mark Urban has learned.
The US Navy is deploying additional warships to the Mediterranean to support possible military action.
Other countries that could take part in any military action include Denmark, Canada, Spain, Belgium, Norway and Qatar. Italy has offered the use of air bases.
On Thursday, the UN Security Council voted to impose a no-fly zone, expand existing sanctions and endorse the use of force - short of an occupation of the country - to protect civilians.
The 15-member council approved the resolution on Libya late on Thursday with 10 votes in favour, none against and five abstentions.
Russia and China - which often oppose the use of force against a sovereign country as they believe it sets a dangerous precedent - abstained rather than using their power of veto as permanent members.
Col Gaddafi has ruled Libya for more than 40 years. An uprising against him began last month after long-time leaders of neighbouring Tunisia and Egypt were toppled.
http://www.bbc.co.uk/news/world-africa-12791910
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