Hundreds of skaters gathered to speed down a hill in Dolores Park in San Francisco before a large police presence arrived to control the crowds.
Things got out of control when one skater took a bad fall and as cops were tending to the injured person, skaters wouldn't stop speeding by. Watch that video below:
After one skater crashed into a police officer, tensions escalated between the groups. It appears that the cop shoved the skater into a squad car, causing him to FLIP OVER IT. Video below:
At least one officer and two skateboarders were treated for injuries.