PORTLAND, ORE. — Protesters in Portland clashed with federal agents for the first time since July in a demonstration targeting a U.S. Immigration and Customs Enforcement building that started Wednesday night and lasted until it was broken up early Thursday, officials said.

The demonstrators spray painted windows on the building, broke several windows and shined laser lights at agents inside — prompting local police to declare the event a riot, meaning authorities could use tear gas and other riot control methods to break up the crowd, Portland police said in a statement.

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