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Protesters gesture, as they demonstrate at Tahrir Square in Cairo, Egypt, Tuesday, July 12, 2011. Egypt's military rulers have sternly warned protesters against "harming public interests" as demonstrators lay siege to Cairo's largest government building and threaten to expand their sit-in to other sites in the capital. (AP Photo/Khalil Hamra)

Protesters gesture, as they demonstrate at Tahrir Square in Cairo, Egypt, Tuesday, July 12, 2011. Egypt's military rulers have sternly warned protesters against "harming public interests" as demonstrators lay siege to Cairo's largest government building and threaten to expand their sit-in to other sites in the capital. (AP Photo/Khalil Hamra)