Police spokeswoman Kimberley Mathews said the assaults had been brazen. "The most recent one, the 13-year-old, she was approached from behind, but did really well and managed to break free."
It was important anyone who knew something about the assaults, or thought they knew who was responsible, called police.
It was likely the victims had been watched before the assaults took place.
Ms Mathews said that as well as walking or running in pairs, people should alert police to any suspicious behaviour. "We would rather know before it's too late."
The incidents at the Gardens began in September when victims aged between 17 and 55 were approached by men and indecently assaulted.
On some occasions, the men spoke to the victims or tried to prevent them from leaving the area.
Police believe at least two men are operating separately.
Counties Manukau police can be contacted on (09) 261 1300. Information can also be provided anonymously to Crimestoppers on 0800 555 111.