Police said they arrested 40 people, most for public drunkenness, NBC News reported.
At least two people were shot and two others stabbed during the chaos in the streets.
The first shooting happened in the Mission District, and the victim was struck in the arm, KPIX-TV reported. The second shooting victim walked into an area hospital with a gunshot wound.
It was unclear if the stabbings were related to the celebrations.
Elsewhere, people were seen mounted on buses and cars:
- The 36 victims in the Oakland warehouse fire were trapped with "no way out" in America's deadliest blaze in over a decade.
- President-elect Donald Trump has picked former WWE CEO Linda McMahon to lead the Small Business Administration.
- Tennessee authorities have charged two minors with starting the massive wildfires that killed 14 people last month.
- This dad had the most adorable freak out to his family when he met his first alpaca 😂