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. 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 statement from Chicago Public Schools said two people showed up at the door of Hamline Elementary School and presented identification including the name Department of Homeland Security, the federal agency that oversees ICE.