VIDEO: San Francisco firefighters made forward progress in a 1-alarm fire at a Richmond District residential home on Sunday afternoon. Firefighters first notified residents on Twitter to avoid the area of 726 18th Ave. at 1:54 p.m. due to an active fire at a three-story building. Fire officials said there are no injuries reported as of 2:12 p.m. Two homes were damaged and one person was displaced, officials said. It's not yet known what caused the fire.