From the BBC:
Hundreds of students have rioted against the police in central China after a fellow student was beaten up by city inspectors, witnesses said.
Students from a number of universities in Zhengzhou, Henan province, burned cars in the four-hour rampage.
They came out onto the streets after inspectors were accused of assaulting a woman student who had set up a street stall, knocking out her front teeth.
A number of inspectors have been disciplined over the incident.
The unrest broke out on Wednesday, after the student was beaten up for apparently selling items on the street without a licence.
As many as 1,000 students from at least three universities took part in the protest, the Hong Kong-based Information Center for Human Rights said.