Police are investigating a stabbing in South San Francisco on Saturday that appears to have started over a red belt, which the suspects may have believed was a gang symbol.

Police received a call about a physical fight between several subjects in the area of Spruce and Commercial avenues at about 1:30 p.m. Saturday. 

Upon arrival, officers located and interviewed several uncooperative people, one of whom had minor injuries from being struck or
punched in the face, according to police.

Officers located two knives in the area. One of the knives had dried blood on the blade.

About two hours later, officers discovered a stabbing victim at San Francisco General Hospital. The victim, who was stabbed in the back, is expected to survive. 

Anyone with information is asked to call the South San Francisco Criminal Investigation Bureau at (650) 877-8900.