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Protesters break windows at the Federal Courthouse in downtown Seattle during a May Day rally on Tuesday, May 1, 2012. Seattle Mayor Mike McGinn says he's making an emergency declaration allowing police to confiscate items that can be used as weapons foll Seattlepi.com, Joshua Trujillo, Associated Press
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CORRECTS STORE TO AMERICAN APPAREL INSTEAD OF NIKETOWN - Pedestrians photograph a shattered window at am American Apparel store, Tuesday, May 1, 2012, after after it was damaged during May Day protests in downtown Seattle. Hundreds of activists across the Ted S. Warren, Associated Press
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Grafitti is painted and a window is broken at an American Apparel store Tuesday, May 1, 2012, after it was vandalized during May Day protests in downtown Seattle. Hundreds of activists across the U.S. joined the worldwide May Day protests on Tuesday, with Ted S. Warren, Associated Press
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A court security officer looks through a broken window after protesters shattered windows on the downtown Federal Courthouse during a May Day rally on Tuesday, May 1, 2012 in downtown Seattle. Seattle Mayor Mike McGinn says he's making an emergency declar Seattlepi.com, Joshua Trujillo, Associated Press
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A worker moves a mannequin away from a broken window at an American Apparel store, Tuesday, May 1, 2012, after it was damaged during May Day protests in downtown Seattle. Hundreds of activists across the U.S. joined the worldwide May Day protests on Tuesd Ted S. Warren, Associated Press
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A worker removes a shattered window from a Niketown store, Tuesday, May 1, 2012, after after it was damaged during May Day protests in downtown Seattle. Activists staged May Day demonstrations around the world on Tuesday to recognize a day traditionally a Ted S. Warren, Associated Press
By Associated Press

SEATTLE — Seattle police have arrested at least a half dozen people as May Day demonstrations turned violent.

Officers and protesters tangled Tuesday evening, following earlier incidents where storefronts were smashed, tires slashed and car windows broken in downtown Seattle.

Police say they recovered homemade incendiary devices made out of toilet paper rolls and fruit juice boxes. Large crowds disrupted the evening commute through downtown Seattle.

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