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A police spokeswoman said three people were arrested for disorder, one person for drug related offending, and another was a warrant to arrest.
Police also noticed there many youths drinking alcohol unsupervised this week, as well as a lot of property damage.
Across the rest of Otago and Southland, it was all "pretty quiet", she said.
A police spokeswoman last night called the under-age drinking "prolific" and said the alcohol appeared to be supplied by parents, which was "very disappointing".