“Initial indications suggest there was a gang-related disorder incident before the man died.
“Police would like to speak to anyone who was in the Ruatoki area and saw or heard anything suspicious between 9pm and 9:45pm,” said Detective Inspector Lew Warner.
They are also seeking anyone with dashcam footage in the area at the time.
“Police have obtained a Gang Conflict Warrant under the Search and Surveillance Act and will not be tolerating any retaliatory gang-behaviour.
“Police will be maintaining a highly visible presence in the area, with extra staff arriving from other districts to support the investigation,” Warner said.
A forensic post-mortem is due to take place tomorrow.
Anyone who had information that could help was asked to contact police on 105, either by phone or online, referencing file number 231211/5404.
Alternatively, information can be passed to Crime Stoppers on 0800 555 111 or crimestoppers-nz.org.