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Anti-government protesters run through tear gas fired by riot police Friday, April 20, 2012, to prevent them from marching toward the hub of last spring's pro-democracy uprising at the end of a mass rally just outside Manama, Bahrain. Tens of thousands of anti-government protesters flooded a major highway in Bahrain demanding a halt to the Formula One race on its first day of practice runs, as the Gulf kingdom's crown prince vowed the country's premier prestige sporting event would go ahead. (AP Photo/Hasan Jamali)