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Minhas Craft Brewery in Monroe announced this week it would start making new batches of beer the week of Jan. 20 — two months after a fire caused more than $2 million in damage to the nation’s second-oldest brewery.

The Nov. 21 fire, which started in a second-floor stairwell and shot to 20 feet above the third-floor roof, was put out within 10 minutes by more than 100 firefighters from Monroe and 18 surrounding communities.

An official cause of the fire has not been determined, but it was believed to have started because of a malfunction in a portable pump being used by a subcontractor to spray foam insulation on the walls of the stairwell, located next to rooms housing the brewery’s fermentation tanks, brewery president Gary Olson said in an interview Thursday.

Olson declined to name the subcontractor, citing ongoing legal work involved with insurance.

No one was seriously injured in the fire, although one Monroe firefighter was treated and released for smoke inhalation and has since returned to work.