UPDATE: Firefighter at downtown fire, taken to hospital

TYLER, TX (KLTV) - Twelve Tyler fire units are now fighting this fire.  A firefighter has been taken to the hospital.

The address of the fire on the downtown square in Tyler is 115 N. Spring Street.  An Assistant Fire Chief with the Tyler Fire Department says the building is believed to be vacant, but they are still checking.  Fire officials are urging people to stay away from downtown Tyler due to thick smoke from this fire.