Immigration enforcement officials have arrested more than 400 people as part of an operation in the Chicago area that launched a little less than two weeks ago, a top Immigration and Customs Enforcement official said Friday.

One person shot in the Green Valley Ranch area early Saturday morning has died. Police are investigating and developing leads about suspect.

The figure offers an early gauge of what is shaping up as a major enforcement effort that comes after similar operations were launched in Los Angeles and Washington, D.C.