The Egyptian army has stepped in to protect pro-Democracy demonstrators in Tahrir Square after a day of violence. The New York Times columnist, Nicholas Kristof has been reporting from the square, where he was wary of the organized and aggressive pro-Mubarak demonstrators as soon as they showed up. He brings us the latest from the scene.

Samer Shehata is an assistant professor of Arab Politics at the Center for Contemporary Arab Studies at Georgetown University. He also warned against violence on Tuesday. He says that these violent tactics are nothing new, and that sending in the "pro-Mubarak thugs" is standard operating procedure for the government.

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