A lunch-hour adventure at a west-end park for a 12-year-old Toronto boy took a frightening turn after he tumbled down a steep hill and landed at the bottom of a ravine.

The Grade 7 boy, who is a student at nearby Swansea Public School, was with a group of friends when he slid down the slippery and snowy hill. The boy, who has not been named, was allowed to wander off school property.

The student was not seriously injured but because he was unable to climb back up the steep hill, emergency crews were called in to rescue him.

Firefighters and paramedics on Thursday descended the hill and strapped the boy to a backboard. Once he was secured, the rescue crew began the treacherous and slow climb up back the hill. At one point during the rescue, a firefighter took a stumble, falling into chest-deep snow. The boy was conscious and alert throughout the entire rescue.

A sign near the hill has since been erected by the city, warning people not to sled or toboggan down the hill.

With a report from CTV Toronto's Tamara Cherry