Fire Marshal: Chemical explosion unrelated to 2013 death

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NORTH ANDOVER, Mass. (AP) — The Massachusetts Fire Marshal says an explosion at a chemical plant that injured four people had a different cause than an explosion at the same plant in 2013 that killed one.

Fire Marshal Stephen Coan says a preliminary investigation found that the explosion Thursday at the Dow Chemical plant in North Andover was caused when a chemical used in the manufacture of LED lights made contact with water.

Coan says Dow is fully cooperating in the investigation.

Emergency workers responded to the plant 30 miles north of Boston at about 2:30 p.m. Thursday. Officials said there was no fire, and no chemicals were released into the air.

Hospital officials said the victims had shrapnel and burn injuries.

The 2013 explosion was caused when a different chemical came into contact with air.

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