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The blast happened when organisers set fire to a wooden figure during a carnival at Villepinte after a traditional parade by local children.
None of the 18 suffered life-threatening injuries. Three were children.
Police said the effigy of a man, made out of plywood, was ignited by petrol using remote control.
The blast showered parts of the crowd with sparks and wooden splinters, which led to the injuries, and caused a momentary panic.
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An inquiry has been opened.