STOUGHTON (CBS) – More potentially deadly undetonated fireworks are turning up in communities across Massachusetts.

State police and ATF agents have been busy blowing up the unexploded shells left over from community fireworks celebrations.

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At least 16 live fireworks shells have been found in Waltham, Worcester, Ware, Wilmington and Stoughton.

Two of them blew up on a park worker mowing the grass in Ware.

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Pyrotechnico, the company behind those fireworks displays is blaming the unexploded shells on a bad batch of fireworks from China.

State Police Bomb tech Mike Noble, who has detonated some of these fireworks, says something as simple as static electricity could set them off, which could be deadly.

“That piece of pyrotechnic is enough to blow your hand off, potentially kill you,” he said.

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The State Fire Marshal has banned Pyrotechnico, the company behind those fireworks shows, from doing business in Massachusetts.