Teens cause chaos with violent brawls at San Francisco's Stonestown mall.

Large scale physical altercations between groups of teenagers have been breaking out at Stonestown Mall in San Francisco, overwhelming the mall's private security. Videos of the fights have been posted on social media, and the incidents have resulted in physical injuries. The San Francisco Police Department has been deployed to address the problem, and the mall has increased security measures. The fights have been occurring during afterschool hours, particularly on Wednesdays, and the San Francisco Unified School District will be addressing the issue.