MOUNT PROSPECT — Kim Fisher was arriving home from a Sunday morning workout with her husband when she saw them: at least three people in fatigues and masks coming out from her backyard, stepping around a chain link fence.

“And I said, ‘What the heck is that?’” said Fisher, a 49-year-old mother of three. “I did not say heck.”

The Fisher family was just one Mount Prospect household roiled by the presence of masked agents, a handful of circling unmarked cars and a helicopter overhead. Neighbors and advocates said a man being detained by federal immigration agents ran away in handcuffs, prompting a manhunt in the northwest suburb of Chicago as officers searched backyards and stopped vehicles.

Several agents had badges and vests that read U.S. Border Patrol or Customs and Border Protection,

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