YUCAIPA, Calif. —  Thousands of hogs rolled into town on Friday for a hell-raising event: the Hells Angels’ 60th birthday, MyFoxLA.com reported.

The bikers gathered in Yucaipa, Calif., to celebrate the club’s founding at an event at the Angels Roadhouse Bar & Grill, which accommodates 2,200 people; some 4,000 were expected to be at the seven-hour bash and the public were allowed in for a $20 cover charge.

Police were out in force and said there was a zero-tolerance policy in effect; Hells Angels could be seen pulled over outside the roadhouse because news cameras were not allowed inside, MyFoxLA.com reported.

The motorcycle club’s first chapter was established in 1948.

Click here for more on this story from MyFoxLA.com.