Fearing federal agents asking to search a Chicago elementary school Friday morning were from Immigration and Customs Enforcement, school officials denied them entry. But it turned out they were US Secret Service agents pursuing an investigation.

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 were seen at a Chicago school Friday afternoon, according to officials with the city's public school district, though a spokesperson for the agency denied such an encounter.