The United Nations authorised military action to curb Libyan leader Muammar Gaddafi on Thursday, hours after he threatened to storm the rebel bastion of Benghazi overnight, showing "no mercy, no pity."
"We will come, zenga, zenga. House by house, room by room," he said in a radio address to the eastern city.
Al Jazeera television showed thousands of Benghazi residents in a central square celebrating the U.N. vote, waving anti-Gaddafi tricolour flags and chanting defiance of the man who has ruled for four decades. Fireworks burst over the city.
Gaddafi had warned that only those who lay down their arms would be spared vengeance to be exacted on 'rats and dogs'.
"It's over. The issue has been decided," Gaddafi said. "We are coming tonight...We will find you in your closets.
"We will have no mercy and no pity."
The U.N. Security Council passed a resolution endorsing a no-fly zone to halt government troops now around 100 km (60 miles) from Benghazi. It also authorised "all necessary measures" -- code for military action -- to protect civilians against Gaddafi's forces.
But time was clearly running short for the city that has been the heart of Libya's revolution.
Residents said the Libyan air force unleashed three air raids on the city of 670,000 on Thursday and there has been fierce fighting along the Mediterranean coastal road as Gaddafi moves to crush the month-old insurrection.
French diplomatic sources said military action could come within hours, and could include France, Britain and possibly the United States and one or more Arab states; but a U.S. military official said no immediate U.S. action was expected following the vote.
Ten of the Council's 15 member states voted in favour of the resolution, with Russia, China and Germany among the five that abstained. There were no votes against the resolution, which was co-sponsored by France, Britain, Lebanon and the United States.