Chicago Public Schools officials claimed Friday that federal agents from U.S. Immigration and Customs Enforcement showed up at an elementary school in the city’s South Side but were blocked by staff from entering.

Law enforcement agents attempted entry into a Chicago elementary school Friday morning, but were not allowed inside or permitted to speak to anyone inside, Chicago Public Schools officials said.

Chicago Public Schools prevented federal immigration officers from going into an elementary school on Chicago’s Southwest Side Friday and talking to students, according to school officials. The agents showed up at 11:15 a.

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.

Chicago Public Schools said its officials made a mistake when they said ICE had gone to a school, mistaken information that caused alarm. It was Secret Service.

The agents turned out to be unrelated to immigration, officials said hours later. They were from the Secret Service, investigating a threat.