Police in London, Ontario, say officers had a busy Friday night responding to three separate riot calls.
Police say two of the calls were about meetings at Thurman Circle, while another involved a meeting on Waterloo Street.
All involved large numbers of young people, many of whom appeared to be drunk, police say.
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In one case, a 24-year-old man was taken to the hospital with non-life-threatening injuries after an apparent assault.
Police say no arrests were made and no suspects were identified in connection with the assault, but police say these events use significant resources over an extended period.
Anyone with more information should call the London Police Service at (519) 661-5670 or Crime Stoppers at 1-800-222-TIPS (8477).
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