The bus was traveling from Milwaukee to Chicago when the incident began around 9:50 p.m., Greyhound said in a statement.
A man who has been living in the country illegally was arrested after authorities say he threatened to kill passengers on a Chicago-bound Greyhound bus.
Authorities found the bus on southbound Interstate 94 and tried to stop it, but did not until after it crossed into IL, the sheriff's office said.
Authorities used spike strips to flatten the tires of the bus, forcing it to stop on Interstate 94 near the IL community of Wadsworth.
Numerous police agencies from Wisconsin and IL are responding to an incident involving a Greyhound bus.
The Sheriff's Office will go through the legal process of extraditing Vargas-Rosas to Racine County, where he will face criminal charges, Schmaling said.
Multiple police agencies were on the scene and motorists are advised to avoid the area.
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Plunkett said once they reach the search zone, work will commence immediately, and the search is expected to last for 90 days. Ocean Infinity's ship is equipped with eight unmanned submarines that scan the ocean floor at depths of almost 20,000 feet.
It's still not known of Vargas-Rosas was actually armed.
All the passengers have been interviewed, and it appears Vargas-Rosas had an altercation with at least two other passengers, Schmaling said.
Williams said at one point he thought the police were escorting the bus, not realizing the situation on the back of the bus.
None of the 40 people aboard were injured, and the suspect was taken into custody after authorities.
"They treated us like we were criminals, like we did something wrong", Williams said. No weapons were found on him when he was booked in the Lake County, IL jail, and officers are continuing to search the bus for any weapons.
The Sheriff's Office is recommending that he be charged with making terroristic threats, a felony, and disorderly conduct.