Libya's opposition showed their defiance to Muammar Gaddafi's threat to kill them all by raising defensive barricades in a Tripoli square today.

New videos show the anti-government protesters raising the country's pre-Gaddafi flag on a building and lining up cement blocks to defend themselves.

The videos were posted on Facebook, a day after Gaddafi vowed to fight to his "last drop of blood" in a televised speech that signalled an escalation of a bloody crackdown on dissent by his supporters.

Some estimates say more than 1,000 people have been killed in the violence sweeping the country.

Video shows the scene in Green Square, Tripoli.

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