10 of 20: A student with her face painted attends a march marking the 44th anniversary of the Tlatelolco massacre in Mexico City, Tuesday Oct. 2, 2012. On Oct. 2, 1968, soldiers opened fire against a student demonstration in Mexico City's Tlatelolco Plaza just before the capital hosted the Olympics. Official reports said 25 people were killed, but human rights activists say as many as 350 may have died. (AP Photo/Eduardo Verdugo) (AP Photo/ Eduardo Verdugo)

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