Chicago - The Department of Homeland Security said Monday that it has launched an immigration enforcement operation here as part of the Trump administration’s effort to target “sanctuary cities,” and immigrant advocates said several people in heavily Hispanic communities have been detained.

The agency did not provide details of the scale or duration of the undertaking in Chicago, which will be led by Immigration and Customs Enforcement. The announcement came after President Donald Trump vowed for weeks that his administration would send federal law enforcement officers — including, potentially, National Guard troops — to the city as part of an effort to crack down on crime.

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