Federal charges have been filed against four individuals involved in the anti-ICE protests in Chicago over the weekend, according to court documents obtained by ABC News.The four defendants are being charged with assaulting and resisting officers outside the Broadview ICE facility during the multi-day protest on Saturday.

Federal authorities are investigating an apparent explosive device found near a Chicago ICE facility after arresting 11 protesters and seizing firearms.

The administration announced a federal operation in the Chicago area more than three weeks ago. Agents have appeared along downtown streets, and National Guard troops are expected.

A Democratic mayor running for Congress in Illinois was tear-gassed Friday morning during a small protest outside an Immigration and Customs Enforcement facility in suburban Chicago, he said.

Federal agents used pepper balls and tear gas against anti-ICE protesters at a Chicago-area facility Friday during a tense standoff in Broadview, Illinois.

Federal agents fired pepper balls and tear gas at protesters near an immigration enforcement building in suburban Chicago.

Federal agents shot pepper ball guns and deployed tear gas on a crowd of protesters gathered outside the Broadview ICE processing center Friday.