A masked demonstrator walks on a beam of a bridge during student demonstrations in Santiago, Chile, Thursday Aug. 4, 2011. Interior Minister Rodrigo Hinzpeter and other Chilean authorities had warned ... more 
A masked demonstrator walks on a beam of a bridge during student demonstrations in Santiago, Chile, Thursday Aug. 4, 2011. Interior Minister Rodrigo Hinzpeter and other Chilean authorities had warned that Thursday's marches were considered illegal and would be met with force. The students, pressing for major changes to Chile's underfunded and unequal public education system, insisted on marching anyway, setting up barricades with burning tires at a dozen points around the city and paralyzing traffic. While many tried to peacefully hold their ground, some hooded demonstrators threw rocks at police cars and passing buses. At least 133 people were detained, authorities said. (AP Photo/Roberto Candia) less 
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Associated Press | Photo By Roberto Candia
Thu, Aug 4, 2011 4:35 PM EDT