Riot police officers walk outside the U.S. embassy in La Paz, Friday, Sept. 12, 2008. Bolivia's President Evo Morales expelled Wednesday the U.S. ambassador to Bolivia, Philip Goldberg, for allegedly inciting violent opposition protests. In response, the Bush administration ordered the expulsion of Bolivia's ambassador to the U.S., Gustavo Guzman. (AP Photo/Juan Karita)

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