Egyptian demonstrators gather at dusk in Tahrir Square in Cairo on Jan. 31, 2011. (Mohammed Abed/AFP/Getty Images)
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Egyptian demonstrator holds a sign up following prayers in Tahrir Square in Cairo, Jan. 31, 2011. (Marco Longari/AFP/Getty Images)
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Anti-government protesters continue to congregate in Tahrir Square on the morning of Jan. 31, 2011. (Chris Hondros/Getty Images)
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Egyptian demonstrators prostrate themselves in prayer in Tahrir Square in Cairo on Jan. 31, 2011. (Mohammed Abed/AFP/Getty Images)
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An Egyptian demonstrator waves the national flag as he and others gather in Tahrir Square, in central Cairo, on Jan. 31, 2011. (Miguel Medina/AFP/Getty Images)
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Egyptian protesters gather near army tanks in Cairo's central Tahrir square on Jan. 31, 2011. (Miguel Medina/AFP/Getty Images)
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Protesters defy the curfew in Tahrir Square on Jan. 31, 2011. (Peter Macdiarmid/Getty Images)
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