Mr Turner would not reveal any details about the person but said they received minor injuries similar to Mr Scullin after they were attacked.
Mr Turner said CCTV footage and information from the community had helped greatly with the investigation, which would continue until police had "hunted down" everyone involved in the assaults.
"Police have names of many of these people but we are still asking for the community to help piece together the last details.
"We are looking for a group of eight or more males, of various ages.
"The majority of these people and their families know we are looking for them and it is only a matter of time until we catch up with them.
"I would urge them to present to a police station immediately."