Cairo, Egypt (CNN) -- Egypt braced for a "march of millions" in anti-government protests Tuesday as embattled President Hosni Mubarak tried to throw up literal and figurative roadblocks in the way of demonstrators calling for his ouster. Major demonstrations are planned for Cairo, Alexandria and other cities, the latest in a series of rallies that began a week ago. Protesters have defied orders for a curfew, and the country's powerful military announced Monday that it would not open fire on peaceful demonstrators. A leading opposition figure told CNN that the United States needs to be ready to "let go of Mubarak," a longtime ally.
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NEW: Egypt tries to cut off travel, communications ahead of new rallies
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NEW: "There is no aggressive behavior from the army," activist says
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Mubarak's VP promises reform, and the army says it won't shoot protesters
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U.S. needs to "let go of Mubarak," ElBaradei says
@placeholder is one of several opposition figures whose names surface when protesters talk about possible future leaders of Egypt.