Activists and neighbors believe the majority of detainees aren’t criminals, and they said immigration enforcement actions they witnessed took place without warrants.

Federal enforcement operations are underway in metro Denver. Over the last few days, U.S. Immigration and Customs Enforcement focused on other cities, notably in the East.

There was a massive show of force Wednesday across the metro Denver region as federal agents conducted surprise operations targeting Venezuelan gang members and other undocumented immigrants with criminal records.