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.

In a statement Friday evening, Chicago Public Schools leaders said that after their initial comments went out about ICE agents, they learned the agents were from the Secret Service. The false alarm heightened fears among immigrant communities in the country’s third-largest city.

Multiple Chicago immigrant advocacy groups have filed a lawsuit against Immigration Customs and Enforcement leaders, saying "the administration's announced raids are retaliatory in nature and violate the First Amendment.

After a raid at a business in Newark, reportedly without a warrant, here's what to know about ICE and immigration enforcement in America.