In a large show force – perhaps the largest since increased immigration arrests began in Chicago earlier in September – dozens of armed federal agents, including members of the Border Patrol, conducted an immigration operation early Tuesday at an apartment complex in Chicago’s South Shore neighborhood.

During the operation, U.S. citizens said they were temporarily detained.

The FBI’s Chicago Field Office confirmed that its agents served in a supporting role for the Border Patrol agents who conducted the immigration enforcement operation.

NBC 5 Investigates learned at least two U.S. citizens were among those temporarily detained as federal agents surrounded the building near 75th Street and South Shore Avenue, according to video posted on the Citizen App and news footage.

It was not

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