Police are investigating a small rubbish fire Sunday night at a Wantagh Elementary School playground, a fire official said.

The playground’s rubber floor, made out of recycled tires, caught fire from burning rubbish, Wantagh Fire Department spokesman Kevin Regan said.

An area about 2 feet by 2 feet burned and about a dozen firefighters put the blaze out with foam, Regan said.

“There was no damage to the playground itself,” he said.

Firefighters were called to the school at 8:38 p.m. and extinguished the blaze within 10 minutes, he said.

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Nassau County arson detectives and the fire marshal are investigating the fire’s cause.

“Whether someone was carelessly smoking or it was intentionally set, I don’t know,” he said.