Police prevent Yemeni government supporters from entering Sanaa University, where anti-government protestors are gathered, in Sanaa, Yemen, on Wednesday, Feb. 16, 2011. The government sent 2,000 policemen into the streets of the capital to try to put down days of protests against the president of 32 years, a key U.S. ally in battling al Qaeda. (AP Photo/Hani Mohammed)
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