At 9:45 p.m., while the bus was in Milwaukee County, at least two passengers aboard the bus called 911 to report a man was threatening to shoot and kill passengers.
Reports of an armed man threatening to kill passengers on a Greyhound bus has led to a dramatic police chase in the mid-western United States.
The pursuit crossed into IL and the bus eventually stopped near the exit ramp to Route 173.
Illinois State Police were notified of the pursuit as the bus crossed the state line and stopped at the I-94 eastbound exit ramp to Illinois Route 173, the agency said in a statement.
Police chased a Milwaukee-to-Chicago Greyhound bus overnight when it was reportedly hijacked by a hostage-taking gunman.
Sheriff Christopher Schmaling said immigration authorities informed him Vargas-Rosas had been previously deported to Mexico.More news: Queen Elizabeth and how her crown could break her neck
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Eastbound I-94 was closed for several hours and traffic was brought to a standstill as authorities remained on the scene.
Several law enforcement agencies from Wisconsin and IL reportedly are now at the scene, surrounding the bus.
The bus driver, who was oblivious to the threats Vargas-Rosas had allegedly made, later said he thought the deputies were either pursuing a different vehicle or conducting a training exercise, Schmaling said. Vargas-Rosas appeared in court Sunday morning in Waukegan, where a Lake County judge denied him bond.
The sheriff stated Saturday that no gun was found on the suspect, but police plan to search the bus for a weapon.
Terrance Williams of New Jersey was in the middle of the bus and initially thought police were escorting the bus, not realizing what was happening in the back.
"They treated us like we were criminals, like we did something wrong", Williams said. Charges against him include making terroristic threats.