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Protesters walk by a burning barricade after a May Day march ended with clashes in Santiago, Chile, Tuesday, May 1, 2012. Clashes with security forces and riots marred the rally that marks International Labor Day. (AP Photo/Luis Hidalgo)

Associated Press
Protesters walk by a burning barricade after a May Day march ended with clashes in Santiago, Chile, Tuesday, May 1, 2012.  Clashes with security forces and riots marred the rally that marks International Labor Day. (AP Photo/Luis Hidalgo)
Protesters walk by a burning barricade after a May Day march ended with clashes in Santiago, Chile, Tuesday, May 1, 2012. Clashes with security forces and riots marred the rally that marks International Labor Day. (AP Photo/Luis Hidalgo)
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