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.

An elementary school in Chicago was thrown into fear and confusion on Friday when district officials mistook Secret Service agents for officials from Immigration and Customs Enforcement.

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.