Top Trump administration officials visited Chicago on Sunday to witness the start of ramped-up immigration enforcement in the nation’s third-largest city as federal agencies touted arrests around the country.

A spokesperson for Immigration and Customs Enforcement said a range of federal agencies conducted "enhanced targeted operations" in Chicago on Sunday "to enforce U.S. immigration law and preserve public safety.

Targeted immigration enforcement operations by multiple agencies were launched in Chicago Sunday, with top Trump administration officials in the city to oversee the operation. Multiple sources told CBS News Chicago that those held by ICE Sunday have active warrants.

Fearing federal agents asking to search a Chicago elementary school Friday morning were from Immigration and Customs Enforcement, school officials denied them entry. But it turned out they were US Secret Service agents pursuing an investigation.

Chicago Public Schools officials incorrectly said U.S. Immigration and Customs Enforcement Agents attempted to enter a South Side elementary school.

Chicago Public Schools prevented federal officers from from going into an elementary school on Chicago’s Southwest Side Friday and talking to students, according to school officials.