Anti-riot policemen run to reinforce their colleagues during clashes with protesters outside the U.S. Embassy in Manila February 25, 2013. The protesters called for the immediate pullout of U.S. troops stationed in the country and denounced the prolonged stay of the U.S. Navy's USS Guardian minesweeper that ran aground at the Tubbataha Reefs, a UNESCO World Heritage site, in western Philippine waters since last month. REUTERS/Romeo Ranoco (PHILIPPINES - Tags: POLITICS CIVIL UNREST MILITARY)