Three police officers were assaulted and 12 people arrested after "several disorder events" during Auckland's Juicy Fest concert on Saturday.
The popular Kiwi tour included performances by T-Pain, T.I, Mase, YG, Trey Songz and Fabolous.
A police spokesperson told Newshub three police officers were involved in "minor" assaults and 12 arrests were made at the event which was attended by approximately 10,000 people.
"There were minor assaults on three Police officers, and officers dealt with several disorder incidents through the night," they said.
Meanwhile, in Wellington, police said six arrests were made during Friday's event for "fighting and disorderly behaviour".
"There were several incidents outside the venue, and police had a strong presence to address any issues," a spokesperson said.
"Officers dealt with several reports of intoxication, disorder, and assault involving people outside the event, including suspected gang members," they said.
Police said one officer was hit with a bottle and injured, leading to the arrest of one man.
One Wellington attendee told The Herald the event was overrun by Mongrel Mob members and said it made him and his wife feel "horrible" due to the large gang presence.
"We had been really excited leading up to it," he said. "Once we got in the huge Mongrel Mob presence was very concerning.
"We tried to not pay it any mind, until I was assaulted from behind when a full can of beer was hurled at my head during one of the numerous fights involving gang members that occurred during the event."
The man said he received no help from police or bystanders.
Newshub has contacted Juicy Fest for comment.
