The Libyan capital Tripoli is a mixture of celebration and fighting as Muammar Gaddafi struggles to hold on to power.
A day after rebels entered the city, heavy fighting is taking place around Colonel Gaddafi's Bab al-Azizia compound from where tanks emerged on Monday and began firing.
Elsewhere, there have been scenes of jubilation as armed residents took to the streets to link up with the rebel forces who are still streaming into the city.
The rebels met little resistance when they entered Tripoli on Sunday, but a BBC correspondent reports there appears to be multiple frontlines and they are not in control of the city.
The government has warned of a bloodbath, saying tens of thousands of soldiers loyal to Colonel Gaddafi will fight the rebels.
Colonel Gaddafi has not been seen in public since May, but made a renewed call for Libyan tribes to come to Tripoli to fight.
In an audio message broadcast on state television on Sunday, he said that if citizens did not defend the capital, there will be no more water, food, electricity or freedom.
The BBC reports that a fierce battle is raging for control of the Tripoli hotel which the government uses as its media centre and the area around remains firmly under its control on Monday.
Families of government employees who have been living at the hotel moved out throughout the day - a sign they believe Colonel Gaddafi's grip on power after four decades is vanishing, the correspondent says.
Meanwhile, in Benghazi, the eastern Libyan city where the anti-Gaddafi revolt started, thousands celebrated in the streets on Sunday.
Fighting first broke out on Saturday night as Muslim clerics used loudspeakers of mosque minarets to call people on to the streets.
Rebel advances on Tripoli came as the NATO military alliance appeared to intensify its air strikes after urging civilians to avoid areas around government installations and arsenals.
Sons detained
The prosecutor at the International Criminal Court has confirmed one of Colonel Gaddafi's sons and intended successor, Saif al-Islam Gaddafi, has been detained.
Another son, Mohammed Gaddafi, has also been taken by the rebels.
An opposition television station says both sons were handed over to the National Transitional Council in Tripoli.
A rebel spokesperson says they want to see Colonel Gaddafi brought to justice too.
Calls for leader to stand down
There have been renewed international calls for Muammar Gaddafi to stand down immediately.
In a statement, United States President Barack Obama said Colonel Gaddafi has to recognise that he no longer controls his country and has to relinquish power once and for all.
British Prime Minister David Cameron says it is clear the end is near for the Libyan leader.
A NATO spokesperson says the Libyan government is crumbling and Colonel Gaddafi should now realise he can not win the war.
However, South Africa, which has close ties with the Libyan regime, says it will not recognise a rebel government.
