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Magna International said the cause of an explosion at one of their auto parts plants in Newmarket on Wednesday morning has been determined.

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In a press release Wednesday afternoon, Magna International said the explosion was due to a “minor arc flash explosion” that occurred on a manufacturing line.

The explosion injured nine people, six of whom were taken to hospital with minor injuries. Magna said these individuals have since been released from hospital.

The plant’s 200 employees had been evacuated from the building while investigators assessed the scene.

The incident occurred at the Dortec Industries plant, which is a division of Magna International Inc., North America’s largest auto-parts maker. The plant is located on Newpark Boulevard in an industrial area of Newmarket.

There were initial reports that there had been a small fire as a result of the explosion, but Central York Fire Services Deputy Fire Chief Paul Leslie said there was no evidence of flame.