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.

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.

The Trump administration launched an immigration enforcement blitz in Chicago on Sunday that includes several federal agencies that have been granted additional authorities to arrest undocumented immigrants in the US,

Trump border czar Tom Homan and TV personality Dr. Phil are in the city to observe the operations, according to reports.

The number of arrests there was uncertain. Illinois officials, including the governor, said they had not been given advance notice.

Top Trump administration officials, including “border czar” Tom Homan and the acting deputy attorney general, visited Chicago on Sunday to witness the start of ramped-up immigration enforcement.

With two top Trump administration officials in Chicago, federal law enforcement began a “targeted” immigration blitz Sunday, according to a spokesman for U.S. Immigration and Customs Enforcement. The agency did not say how many arrests have taken place so far.

Acting U.S. Deputy Attorney General Emil Bove and Border Czar Tom Homan oversaw immigration enforcement efforts in Chicago on Sunday, as efforts got underway across the country.

Acting Deputy Attorney General Emil Bove, appointed by President Donald Trump, will oversee the efforts of the FBI, DEA, ATF, U.S. Marshall Service, and federal prosecutors.