A schoolboy has been left with scraped knees after falling into a playground sinkhole at South Wellington Intermediate School yesterday, Radio New Zealand reported.

The sinkhole, in an asphalt court, is about the size of a dinner plate at the surface, but the size of a dining table beneath, RNZ said.

Acting principal Howard Young told RNZ he was not sure of the extent of the problem.

"We've had the emergency man, we've had the regional adviser in, they've organised builders in to sort of create a barricade around the hole itself," he said.

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It is believed a broken connection in an underground stormwater drain caused the hole.