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San Antonio firefighters had difficulties battling a two-alarm fire overnight in downtown San Antonio. A blaze broke out in the two-story building off Urban Loop near I-35 and Cesar Chavez Boulevard at about 11 p.m. Firefighters had to move out of the building after it became too dangerous due to part of it collapsing. No one was injured. Investigators believe it may have been started by homeless people trying to stay warm.