San Jose police arrested 11people during a Cinco de Mayo celebration on Sunday, after they said 300 to 400 people swarmed the downtown area.
All was relatively quiet until about 10 p.m. at Santa Clara and 21st streets.
That's when Lt. Jason Na reported there was a stabbing and that people damaged a VTA bus by throwing bottles at it. VTA spokeswoman Brandi Childress said the windows were smashed, but they are epected to be repaired and back in service later this week.
The mayhem was quickly stopped by police in riot gear.
"We used everything we had to disperse the crowd," Na said.
No one was injured, despite several bottles being thrown.
Last year, there were 23 arrests.