Police say a fire that engulfed an outdoor playground at a Scarborough elementary school is being treated as arson.

The blaze broke out at a playground outside St. Agatha Catholic Elementary School near Kingston and Brimley roads at around 4:30 p.m. Tuesday.

By the time crews got the fire under control a short time later, about half the playground had burned to the ground, according to police.

The total cost of the damage is not known.

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