by Patrick Appel

Robert Mackey is live-blogging:

As my colleagues David Kirkpatrick and Kareem Fahim report from Cairo, President Hosni Mubarak's decision to put troops on the streets appeared to backfire on Saturday, "as troops and demonstrators fraternized and called for the president himself to resign. While some protesters clashed with police, army tanks expected to disperse the crowds in central Cairo and in the northern city of Alexandria instead became rest points and even, on occasion, part of the protests."

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