Illinois State Police were notified of a pursuit out of Wisconsin involving the bus, police said.
Greyhound said in a statement Friday night, "The bus with 50 customers onboard was en route from Milwaukee to Chicago when the incident began around 9:50 pm CST".
The pursuit crossed into IL and the bus eventually stopped near the exit ramp to Route 173. A person on the Greyhound bus made threats to harm passengers according to public safety radio transmissions.
Kenosha County, Wis., sheriff's Lt. Rory Zuerlein said his agency received a call around 10 p.m. that an armed passenger on the bus was threatening other riders, the paper reported.
South and North Korea discuss joint women's ice hockey team for Olympics
Before the meeting, South Korea has proposed working-level talks with North Korea on Monday at the truce village of Panmunjeom. South Korea's unification ministry and sports and tourism ministry, however, both said they have no knowledge of the matter.
ISP say the suspect is in custody.
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.
Authorities said no injuries were reported.
Drivers are advised to avoid the area.