The Brief 22 elementary school students ingested cannabis edibles on Tuesday. Emergency crews responded to Fort Dearborn Elementary at around 1:40 p.m. Three children were treated and released from Christ Hospital. Authorities responded to a South Side elementary school Tuesday afternoon after 22 children ingested marijuana edibles, according to Chicago police and school officials. What we know:Police and emergency crews were called to Fort Dearborn Elementary School, located in the 9000 block of South Throop Street in the Brainerd neighborhood, around 1:40 p.m. for a medical incident involving multiple students. Earlier today, we were made aware that a few members of our school community had ingested an unknown substance.