Detective Senior Sergeant Peter, Investigations Manager Kapiti-Mana Police says the assault has involved rival gang members and more people are believed to be linked to the altercation.
Seven people were today arrested and charged with wounding with intent to cause grievous bodily harm following a police sting at eight Porirua addresses.
"Four were due to appear in Porirua District Court this afternoon, and three will undergo a youth process," Middlemiss said.
But more people are believed to have been involved in the assault, Middlemiss said.
Police have released images of the man Middlemiss says will be able to help officers in the case.
Anyone who knows this man's identity should call 105, quoting file number 201011/9236, Middlemiss said.
"We want to assure everyone that Police are committed to identifying all those responsible for this incident and holding them to account," he said.
"We want our community to feel safe, and we hope these arrests provide some reassurance that this type of violent behaviour from gang members will not be tolerated."
Can you help? Anyone with information or concerns about this type of activity should contact their local Police station on 105, or phone Crimestoppers anonymously on 0800 555 111.
Surfers at a popular beach in the Waikato had an unforgettable encounter on Saturday when they were joined in the waves by a pod of playful orca whales.
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