Metro

Off-duty firefighter spots fire on roof of Chelsea bakery

The morning shift at a Chelsea commercial bakery was safely evacuated Tuesday after an off-duty Chelsea firefighter spotted flames and heavy smoke pouring from the roof, triggering a two-alarm response by firefighters.

About 65 workers were on duty at the Muffin Town commercial bakery on Crescent Avenue when the firefighter spotted the flames and smoke, Chelsea Deputy Fire Chief John Quatieri said in a telephone interview.

The workers had just begun warming up the large commercial oven to begin baking for the day when it caught on fire and that fire then spread to the roof, Quatieri said.

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The two-alarm fire took an hour for firefighters to knock down, Quatieri said.

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A mechanical malfunction in the oven was likely the cause of the fire, but a more precise cause is under investigation, Quatieri said.

The factory reopened shortly after the fire, said Laureen Dorgan, Muffin Town human resources director.

“It was a non-issue,” she said.

The extent of the damage is being evaluated, officials say.

Maddie Kilgannon can be reached at maddie.kilgannon@globe.com. Follow her on Twitter @MaddieKilgannon.