Seattle

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Fire fighters extinguish a fire during May Day activities Thursday, May 1, 2014 in Seattle. Police have made several arrests and fired pepper spray as anti-capitalist marchers meandered through Seattle several hours after hundreds of peaceful demonstrators took part in a May Day march in support of immigrant rights and a boost in the minimum wage. (AP Photo/Ted S. Warren)

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Protesters burn signs during May Day activities Thursday, May 1, 2014 in Seattle. Police have made several arrests and fired pepper spray as anti-capitalist marchers meandered through Seattle several hours after hundreds of peaceful demonstrators took part in a May Day march in support of immigrant rights and a boost in the minimum wage. (AP Photo/Ted S. Warren)

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Police form a line during May Day activities Thursday, May 1, 2014 in Seattle. Police have made several arrests and fired pepper spray as anti-capitalist marchers meandered through Seattle several hours after hundreds of peaceful demonstrators took part in a May Day march in support of immigrant rights and a boost in the minimum wage. (AP Photo/Ted S. Warren)

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Police detain a protester during May Day activities Thursday, May 1, 2014 in Seattle. Police have made several arrests and fired pepper spray as anti-capitalist marchers meandered through Seattle several hours after hundreds of peaceful demonstrators took part in a May Day march in support of immigrant rights and a boost in the minimum wage. (AP Photo/Ted S. Warren)

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Police extinguish burning signs during May Day activities Thursday, May 1, 2014 in Seattle. Police have made several arrests and fired pepper spray as anti-capitalist marchers meandered through Seattle several hours after hundreds of peaceful demonstrators took part in a May Day march in support of immigrant rights and a boost in the minimum wage. (AP Photo/Ted S. Warren)