A reported sighting of immigration agents attempting to enter an elementary school on Chicago’s Southwest Side on Friday was actually U.S. Secret Service agents investigating a threat, a federal spokesperson said late Friday afternoon.

U.S. Immigration and Customs 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.

However, a spokesman for Immigration and Customs Enforcement said it was not their agency that attempted to enter the school.