Photo Gallery: Riots in Pakistan: Sept. 21, 2012 5/20

A Pakistani protester reacts to tear gas during clashes that erupted as the demonstrators tried to approach the U.S. embassy in Islamabad, Pakistan, Friday, Sept. 21, 2012. Over a dozen people were killed as tens of thousands protested against an amateurish anti-Muslim film produced in the United States and vulgar caricatures of the Prophet Muhammad published in a French satirical weekly around the country after the government encouraged peaceful protests and declared a national holiday â "Love for the Prophet Day." AP photo