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)
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)
