The unrest was sparked when the owner of a children's clothing firm in Huzhou city refused to pay his tax bill.
Reports say the man gathered friends to attack the local tax collector, and the row snowballed into a riot where people threw stones and overturned cars.
China has thousands of riots every year, often sparked by minor rows.
Analysts say the riots - or "mass incidents" as Chinese officials call them - are often fuelled by economic pressures such as the rapidly rising cost of basic goods. Read More