KITCHENER -- A person was airlifted to hospital with life-altering injuries after a snowmobile collision on Thursday night.

The incident happened at around 11:30 p.m. in Norwich Township. Provincial police say four people were riding snowmobiles on a trail west of Base Line and north of Norwich Road when a 52-year-old was ejected from a snowmobile that crossed over a lane between fields.

The operator of a second snowmobile, a 37-year-old from Oxford County, hit the first rider. They were taken to local hospital and then airlifted to a Hamilton hospital for treatment.

The investigation is ongoing and updates will be provided as new information becomes available, police say.