TFD responds to structure fire south of downtown Tucson TFD responded to a structure fire south of downtown Tucson on Dec. 25th. (Source: Tucson Fire Department) By KOLD News 13 Staff | December 25, 2020 at 7:43 PM MST - Updated December 25 at 9:11 PM TUCSON, Ariz. (KOLD News 13) - On Friday, Dec. 25th before 7 p.m., the Tucson Fire Department responded to a structure fire just south of downtown Tucson. TFD personnel responded to the area of 1300 S. 6th Ave, where a crew of about 24 firefighters assisted in handling the blaze. There are still not many details available at this time, and the cause of the fire remains under investigation.