CHICAGO — Protesters tried to block vehicles Friday outside a federal immigration enforcement building in suburban Chicago, leading to a confrontation with authorities who arrested multiple people and used a chemical agent to disperse the crowd.

The protest is part of steady pushback against an immigration enforcement surge focused on Chicago and surrounding communities, which has put more federal agents on the streets charged with delivering on President Donald Trump's promise of mass deportations. The Department of Homeland Security said Friday that almost 550 people have been arrested as part of an operation that launched just under two weeks ago.

Friday's protest included dozens of people carrying American flags and signs with the words “Hands off Chicago." Some participants tried to

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