Chicago — Demonstrators attracted by the NATO summit tip over barricades Sunday.

PHOTOGRAPH BY: William DeShazer / Chicago Tribune

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Chicago — Police line up in front of the Art Institute of Chicago on Sunday.

PHOTOGRAPH BY: William DeShazer / Chicago Tribune

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Chicago — Two men are arrested at Michigan Avenue and Cermak Road during a march and rally on Sunday.

PHOTOGRAPH BY: Scott Strazzante / Chicago Tribune

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Chicago — Protesters from the Black Bloc group move through a crowd during the NATO summit on Sunday.

PHOTOGRAPH BY: Chris Walker / Chicago Tribune

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Chicago — Chicago police Supt. Garry McCarthy assists during a clash Sunday with protesters attracted by the NATO summit.

PHOTOGRAPH BY: Scott Strazzante / Chicago Tribune

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Chicago — A member of the Clown Bloq brings up the rear of an antiwar demonstration Sunday during the NATO summit.

PHOTOGRAPH BY: Brian Cassella / Chicago Tribune

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Chicago — Protesters clash with police during a demonstration Sunday at the NATO summit.

PHOTOGRAPH BY: Michael Tercha / Chicago Tribune

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Chicago — Marcher move south Sunday on Michigan Avenue for a rally near McCormick Place.

PHOTOGRAPH BY: Zbigniew Bzdak / Chicago Tribune

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Chicago — Antiwar protesters make their voices heard on Sunday during the NATO summit.

PHOTOGRAPH BY: Michael Tercha / Chicago Tribune

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Chicago — Police and bystanders watch as a protest march passes by during the NATO summit on Sunday.

PHOTOGRAPH BY: Scott Strazzante / Chicago Tribune

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Chicago — Maryellen Schmidt, 73, of Milwaukee, walks down Michigan Avenue during an antiwar march on Sunday.

PHOTOGRAPH BY: Keri Wiginton / Chicago Tribune

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Chicago — Mark Rutte, center, the prime minister of the Netherlands, shakes hands with NATO Secretary-General Anders Fogh Rasmussen while greeting President Obama at the McCormick Place convention center in Chicago on Sunday.

PHOTOGRAPH BY: Stacey Wescott / Chicago Tribune

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