NEW YORK — Several protesters were arrested Saturday amid scuffles with police officers outside the entrance of a parking garage in lower Manhattan where dozens of federal agents had appeared to be gathering for an immigration raid nearby, according to police and witnesses.

The confrontation, which appeared to foil the raid, underscored the numerous challenges the federal government faces in trying to stage raids in a dense city like New York, where pushback from protesters in a largely liberal city appears inevitable.

The standoff began just after 11 a.m., when a handful of protesters gathered outside a garage on the edge of Chinatown, on Centre and Hester streets, where agents from U.S. Customs and Border Protection and the Department of Homeland Security had been arriving.

As the age

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