Roaming mobs of teens clash in San Francisco mall brawls as bystanders caught in crosshairs:

Mobs of teenagers have clashed in a string of violent San Francisco mall brawls, caught on video in one melee attacking and stomping each other as well as seemingly innocent onlookers.

San Francisco police told Fox News Digital in a statement that three separate incidents took place at the Stonestown Galleria mall from March 15 to March 17 that involved groups of juveniles attacking each other or bystanders.

"On Friday, several youths were pepper sprayed by other youth," the department said. "Officers responded to the scene and the youth dispersed from the area. Officers discovered one youth suffering from injuries as a result of the physical altercation."

The victim was treated at a hospital for non-life-threatening injuries, police said. No arrests have been made.

Cellphone video from one incident around 4 p.m. Friday inside a Target store shows a group of young people pouncing on a man and then slamming him to the ground.

"Over the past couple of weeks, there have altercations between young folks at Stonestown mall resulting in physical injuries," District 7 Supervisor Myrna Melgar posted on Twitter on Sunday.

"Stonestown private security was overwhelmed and SFPD officers were deployed. Videos of the altercations have been posted and promoted on Instagram live."

Melgar said the mall will be increasing its security patrols. "I'm very scared," food court vendor Guang Wei, who witnessed one of the fights at the food court, told CBS Bay Area. "I cannot continue to do business here in this kind of environment."