Egyptian President Hosni Mubarak has promised social and economic reform and has sacked his government in a bid to appease angry protesters who have taken to the streets to voice their anger over the last four days. But as thousands defied an imposed curfew overnight, is the regime powerless to assert its authority? The BBC's John Sudworth reports from the streets of the Egyptian capital of Cairo and the British ambassador to Egypt, Dominic Asquith, comments on the demonstrations.

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