Police surrounded a Greyhound bus after an incident involving a possible gunman on I-94 at Illinois Route 173, Illinois State Police confirmed Friday.
Wisconsin and IL law enforcement attempted to stop the bus after a passenger called 911, officials said. The bus crossed into IL and was stopped near I-94 at Rt. 173.
A person on the Greyhound bus made threats to harm passengers according to public safety radio transmissions.
The Lake County Sheriff's Office says a man with a gun was reported on the bus.
Authorities announced the unidentified suspect was in custody after 12:30 a.m.
Approximately 40 passengers aboard the bus have been safely removed - and there are no injuries reported.
The chase began in southern Wisconsin and ended on Interstate 94 near the Wadsworth exit, according to a news release from the Illinois State Police.
Multiple agencies are at the scene responding to the incident.