A blaze in a condominium building in Fairfax County displaced dozens of residents and caused millions of dollars in damage, the county fire department said.

       The fire broke out Monday in the 4200 block of Mozart Brigade Lane and displaced about four dozen people, the fire department said. The site is in the Fair Lakes area, about half a mile west of Fair Oaks Mall.

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       Damage to the building and 24 condos came to more than $4.1 million, according to the fire department.

       A firefighter suffered minor injuries. None of the residents were injured, the fire department said.

       The cause is under investigation, the fire department said.