CHICAGO - Through the second week of Operation Midway Blitz in Chicago, the Department of Homeland Security said it’s detained more than 500 individuals since the start of the stepped-up immigration enforcement campaign.

Federal officials claim they are targeting violent criminals, although there have been reports that agents have accidentally detained a U.S. citizen near suburban Elgin , but later released him.

An agent also shot and killed an undocumented immigrant in northwest suburban Franklin Park who officials said had a history of reckless driving.

Disputes over arrests

What we know:

On Monday, U.S. Sen. Dick Durbin (D-Illinois) said he’s not necessarily buying the official numbers from DHS.

"Fewer than 30% of those who've been arrested have any kind of criminal backgr

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