Fairfax County Fire and Rescue crews rushed to Midtown Condominiums at Reston Town Center Sunday after an underground transformer sparked.

While smoke was visible from street grates, there were no visible flames despite the two-alarm call that brought more than a dozen fire trucks to scene at 11990 Market St. shortly before 11 a.m. Sunday.

Power was out in the building, and most residents (as well as employees of Subway and Roosters on the ground floor) self evacuated.

Market Street, Explorer Street and the area around Reston Town Square Park were blocked off until about 2 p.m.

Residents said they were back in the building with generator power Sunday afternoon.