A protester is detained by police. (Matt Rourke / Associated Press)
A protester is overcome by tear gas. (Chris Hondros / Getty Images)
A Pittsburgh resident shows solidarity with the protesters. (Matt Rourke / Associated Press)
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Members of the National Guard carry riot gear. The march turned chaotic about the time President Obama and the first lady arrived for a meeting with leaders of the worlds major economies. (John Moore / Getty Images)
