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"[The explosion] really shook the ground. It was really loud. A lot of smoke for miles and miles, really loud explosion. I thought it was time to leave, to get out of there," says another witness.
There are conflicting reports from witnesses to exactly what caused the accident.
Michigan State Police are handling the investigation.
We're told Ron Thomas was taken to the hospital with minor injuries.
"They're taking him to the clinic. He's got burns on his head and his hands. He's going to be okay. He's a hero," says his brother.
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