Fights mar 49ers-Raiders game at Levi's Stadium; 11 arrested

Chaos at Levi's Stadium, the disturbing video of a brawl at the Niners-Raiders game, and it was just one of several incidents that led to nearly a dozen arrests. Good evening, everyone. I'm Mike Meebeck. And I'm Claudine Wong. The 49ers win against the Raiders is now being overshadowed by violence that happened between fans. Multiple fights broke out both inside and outside the stadium. KTVU crime reporter Henry Lee live tonight in Santa Clara with more on the violence as well as those arrests. Henry. Mike and Claudine, tensions were high before, during, and after the game here at Levi's Stadium where fights broke out inside and out here in the parking lot. Santa Clara Police made nearly a dozen arrests. Video that's gone viral shows two men fighting outside Levi's Stadium during the 49ers-Raiders game on Sunday. One of the men gets knocked out, but the other is then himself laid out by a guy in a 49ers jersey and is repeatedly punched by the crowd. And that was just some of the lawlessness and fights both inside and outside the stadium that kept security and Santa Clara police busy on the day the Raiders were crushed by the Niners, 38-17. As seen in these other viral videos that have spread online, there were fights in the stands. Another fight happened in the concourse, where a Raider fan ends up on the ground, also apparently knocked out. Santa Clara police say they arrested seven for public intoxication and four for fighting. Forty-five people were ejected. The department says incidents of violence at large-scale events will not be tolerated and that investigations are ongoing into fan-on-fan attacks. So you have frustration, aggression, diffusion of responsibility. Alcohol. Toxic mix. Thomas planned as a psychology professor at Santa Clara University. He says the former cross Bay rivalry between the 49ers and the Raiders did not vanish once the Oakland team moved to Las Vegas. The different cultures of the Niners and the Raiders often leading to an immediate clash. The Raiders are more of the beer team and the 49ers have been sort of the Chardonnay team. And I think that that's also plays a role into this dynamic. In fact, fan behavior got so bad during the Battle of the Bay, the NFL put an end to the 49ers-Raiders preseason matchup after a particularly violent game at Candlestick Park back in 2011. The games resumed after the Raiders moved to Vegas. Now, Santa Clara police say some of the victims of these fights did not want to cooperate with law enforcement. Nevertheless, anyone with information about any of these incidents is asked to give the department a call. Live in Santa Clara, Henry Lee, KTVU, Fox 2 News. I mean, Niners, Raiders, Henry, did Santa Clara PD beef up patrols for this game? Do they know something probably may happen or reach out to the sheriff's department and ask for assistance? Yeah, they don't talk about staffing, but you can bet that they had a lot of pre-season or pre-game planning for this, knowing that this would be a big game for fights and possible unrest. And lots of videos, Henry. Do we know if they're planning on more arrests? And do we know anything about the condition of the people we see unconscious and beaten up in some of these videos? Yeah, a lot of these guys are bloodied and bruised, but again, some of these people don't want to come forward. No word on any of the conditions per se, but certainly more arrests are possible because the department's certainly aware of a lot of these viral videos. Got it. Henry Lee, live tonight outside Levi's Stadium in Santa Clara. Henry, thank you.