Protesters in Alexandria
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'Secret policeman' dragged from Alexandria protests

Tens of thousands of Egyptians have been taking part in a "day of departure" to try to oust President Hosni Mubarak.

In Egypt's second city of Alexandria there is a heavier army presence than in previous days.

The BBC's Wyre Davies witnessed a 'secret policeman' being targeted amid protests in the centre of the city.

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