Toronto police Chief Mark Saunders has admonished party-goers for their reckless behaviour during an all-night outdoor arts festival over the weekend that left three police officers injured.
Saunders says they were responding to calls about a person with a gun at Nuit Blanche and the crowd fled when a fight broke out shortly after police arrived.
He says a young woman was trampled in the process.
Saunders says many in the crowd appeared to be under the influence of alcohol or drugs during the party and the mood shifted when officers arrested a man who allegedly had an imitation gun, a baton and a knife.
The police showed videos from social media of fights and bottles being launched at police officers.
Saunders says three officers were injured, including one officer who broke a bone in his hand, but describe all injuries as minor.