At least 11 people were arrested -- and 45 others were ejected -- after several fights erupted during and after a game between the San Francisco 49ers and Las Vegas Raiders at Levi's Stadium, according to reports.

Videos circulating online showed melees in the stands and parking lots, including a large brawl in which two people appeared to be knocked unconscious, on Sunday.

Citing information from the Santa Clara Police Department, SF Gate reported that four people were arrested for fighting in a public place, while one also faced a drug-possession charge. Seven others were arrested on suspicion of disorderly conduct tied to alcohol consumption, the media outlet noted.

"Incidents of violence at large-scale events in Santa Clara will not be tolerated," Santa Clara Police Department spokesperson Lt. Eric Lagergren wrote in an email to SF Gate, per the outlet. "The Department strictly enforces the law and holds individuals accountable for criminal conduct. We will seek to arrest the individuals responsible for the fan-on-fan violence at the event."

The game marked a renewal of the "Battle of the Bay" rivalry, the first regular-season meeting between the teams since the Raiders moved from Oakland to Las Vegas in 2020.

The 49ers reportedly said they have a zero-tolerance policy for violence and that stadium security and police responded to several incidents.

Police said the incidents remain under investigation and urged witnesses to come forward, according to SF Gate.

The 49ers won the game 38-17.