MESA, Ariz. (CBS/AP) — A fire at a huge plant owned by tech giant Apple Inc. in the Phoenix suburb of Mesa caused a section of the roof to collapse, but no one was hurt.

Deputy Chief Forrest Smith of Mesa Fire and Medical says Tuesday’s fire at the 1.3 million-square-foot plant was confined to a section of the roof over a loading dock. He says the intense blaze may have been sparked by rooftop solar panels.

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Crews from Mesa and several other fire departments battled the blaze for 35 minutes before gaining control. About 45 workers were evacuated.

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Apple bought the plant in 2013 to manufacture sapphire glass for its products. That effort failed, and the company announced in February that it would convert the plant into a data center.

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