CHARLESTON TOWNSHIP, Mich. – At least 22 people were injured — one of them critically — on Thursday after a Greyhound bus travelling from Toronto to Chicago hit the back of a semi-truck in southwestern Michigan.

The Kalamazoo County Sheriff’s office described most of the injuries as minor, but said some of the 48 passengers and the driver were taken to hospital for treatment.

Passengers said most of those who were injured were sitting toward the front of the bus, and the sheriff’s office said a front-seat passenger is listed in critical condition.

Officials initially reported 11 people were hurt.

The crash happened about 10:30 a.m., about 20 kilometres east of Kalamazoo.

“I woke up just saw glass shattering everywhere all over me,” Marissa Desimone of the Toronto area told a local Michigan TV station, Wood TV 8.

Desemone, who was headed with friends to the Lollapalooza concert that starts Friday in Chicago, was sitting directly behind the bus driver. She told the TV station that her head slammed into the glass in front of her and the woman next to her was thrown from her seat.

A Kalamazoo Metro Transit bus was brought to the crash site to get other passengers from the Greyhound bus.

They were taken to a transportation centre in downtown Kalamazoo where they boarded another bus that took them to Chicago.

Greyhound Canada was not immediately available to comment.