A vacant building just north of downtown which has burned before caught fire again overnight, and the cause is a mystery, News Radio 1200 WOAI reports.
First arriving fire companies reported heavy smoke and flames coming out of the commercial building in the 800 block fo North Main, not far from San Antonio College.
Nobody was hurt. Arson investigators have been called to investigate.
Firefighters have had problems with homeless people squatting in vacant homes and buildings, and setting fires to keep warm.