SPRINGFIELD, Mass. (WWLP) - Investigators have completed their inquiry into the fire that erupted at Chet's Scrap Metal in Springfield in August, but the cause remains undetermined.

Commissioner B.J. Calvi of the Springfield Fire Department suggested that a lithium-ion battery might have sparked the blaze, based on video evidence.

"The official cause of the fire is still undetermined," said Commissioner B.J. Calvi. "Our hypothesis, based on how the fire started, based on video evidence, is that there was probably a lithium-ion battery that went into the waste stream."

The fire at Chet's Scrap Metal was a large 4-alarm blaze that sent thick black clouds of smoke into the air over Springfield.

Lithium-ion batteries, which are found in devices such as electric bikes, skateboards, power to

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