An 11-year-old girl on a school ski trip was killed Thursday when she struck a tree while skiing at Calabogie Peaks Resort.

The girl was wearing a helmet and suffered critical injuries.

Although the child was treated by paramedics and airlifted to the Children's Hospital of Eastern Ontario, she died of her injuries.

An official with the Upper Canada School Board says the little girl attended Perth Elementary School.

Her name has not yet been released.

An autopsy is scheduled for today to determine the girl's exact cause of death.

Ontario provincial police are investigating.