Protests Erupt At Portland Police Building, Mayor's Condo

Protesters hold their fists in the air during a Black Lives Matter march on Aug. 28.

Photographer: Nathan Howard/Getty Images

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Portland, Ore. (AP) -- Fires set outside a police union building that's a frequent site for protests in Portland, Oregon, prompted police to declare a riot early Saturday and detain several demonstrators.

An accelerant was used to ignite a mattress and other debris that was laid against the door of the Portland Police Association building, police said in a statement. At least one dumpster had also been set on fire in the street nearby.