Overview
- Investigators concluded the June 4 incident on I-290 near Mannheim Road was an explosion that killed one person who has been identified as 47-year-old Jorge Vaca of Cicero.
- Illinois State Police first responded and then summoned the Cook County Bomb and Arson Squad along with FBI, ATF and DEA teams to process the scene using explosive‑response procedures.
- Officials used an evidence tent, markers and other forensic steps while the vehicle — reported as a Volkswagen SUV with blown-out windows — was examined and later towed from the westbound lanes.
- I-290 was closed for nearly nine hours during the response, causing widespread traffic backups as crews worked to secure and investigate the roadway.
- Federal authorities say there is no evidence the blast is linked to other events or additional suspects and the Cook County Medical Examiner will release final findings on cause and manner of death when testing is complete.