A new audio message has been broadcast from Colonel Gaddafi, urging Libyans to destroy the rebels, as heavy fighting again broke out in parts of Tripoli. In the message addressed to the people of Libya, Colonel Gaddafi said enemy rats had to be resisted and the Libyan capital liberated. Rebel forces are now advancing on Gaddafi's hometown, Sirte. Marco Werman talks with the BBC's Rana Jawad in Tripoli.
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