OPP are canvassing a neighbourhood in Alliston after a woman was sent to hospital in critical condition.

Emergency crews were called to a home on Stewart Avenue on Sunday, around 5 p.m. Inside, crews found a 41-year-old woman with critical injuries.

The woman was transported to hospital, but the circumstances surrounding her injuries are unknown.

The OPP crime unit are on scene collecting evidence.

At this point the OPP say there is no threat to public safety, but they will not say why they were called to the house, or what caused the woman's injuries.