Chicago Public Schools CEO Pedro Martinez said it was all a "misunderstanding" after U.S. Secret Service agents showed up at Hamline Elementary School and were mistaken as Immigration and Customs Enforcement (ICE) officers.

The Secret Service is continuing to release information after Chicago school officials responded to what they thought was an ICE action Friday.

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.

The U.S. Secret Service told the I-Team they approached a South Side school Friday. Chicago Public Schools officials had initially said the agents were from U.S. Immigration and Customs Enforcement.

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

Despite earlier reports that ICE agents tried to enter a Chicago elementary school Friday, the agency says it wasn't them. So what exactly happened?

CHICAGO -- The U.S. Secret Service said its agents visited a Chicago elementary school Friday while investigating a threat, hours after school officials mistakenly claimed that U.S. Immigration and Customs Enforcement agents had come to the building.

The U.S. Secret Service says their agents came to the school to investigate a threat, not to enforce immigration laws. Their arrival spread fear in a community on high alert.

Officials with Chicago Public Schools claimed U.S. Immigration and Customs Enforcement agents were seen at Hamline Elementary School. The Secret Service said special agents were investigating a threat.

Chicago Public Schools officials reportedly mistook Secret Service agents for ICE officers during a chaotic morning incident amid migrant crackdowns.

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.

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.