Invercargill police Detective Sergeant Mark McCloy said it was believed the incident could be gang-related.
While discussions with the victim have been conducted, McCloy encouraged anyone with relevant information to inform police.
"If you saw anything unusual or suspicious in the area of the eastern end of Tweed St on Saturday afternoon, around 4-5pm, please get in touch with police on 105 and quote file number 211003/3406," he said.
Information can also be provided to Crime Stoppers anonymously on 0800 555 111.
McColy wanted to reassure the community that police were "hugely focused" on locating those responsible.