No arrests have been made in connection with Sunday’s stabbing outside Candlestick Park while the 49ers played the Raiders.
The victim and family members were partying at the stadium when they engaged in an argument with a group of about 10 people walking past around 1:40 p.m., police said.
The verbal spat led to a brutal brawl. One of the party crashers, who was wearing a 49ers jersey, stabbed a tailgater in the lower part of his body, police spokesman Officer Albie Esparza said.
“It remains unclear at the time of the incident if the victims and suspects knew each other or happened to meet that day,” Esparza said.
A second party-crasher smacked another tailgater “on the side of the head with a cooler, knocking him to the ground,” police said. The victim suffered a swollen eye and lacerations to his face, Esparza said.
The cause for the fight remains under investigation, he said.
Games between Bay Area rivals the 49ers and Raiders are known to have violent clashes between fans.
Both the victims and suspects were described as Hispanic men in their early 30s, police said. The victims were taken to San Francisco General Hospital and treated for injuries not considered life-threatening, police said.
Cops are hunting the assailants, who fled after the fight. One suspect was described as standing 5-foot-10 with a skinny build, police said.
The suspects were with two females at the time of the altercation, and they were questioned by police at the scene, according to authorities.
It was not the first report of violent crime at one of The City’s professional sporting events. In 2008, an 18-year-old San Francisco Giants fan was killed after he was punched in the head during a fight outside the ballpark. He died from brain injuries sustained after hitting the ground.
Bay City News contributed to this report.