The incident happened at a Paremata service station around 1.15pm on Sunday 11 October, police say.
A man was taken to hospital with serious injuries after being stabbed.
Police say investigations have determined the altercation involved rival gang members.
“Today Kapiti-Mana Police executed search warrants at eight addresses in Porirua and seven people were arrested and charged with wounding with intent to cause grievous bodily harm,” police said in a statement.
“Four were due to appear in Porirua District Court this afternoon, and three will undergo a youth process.”
Police also released the image of a man they believe may be able to help inquiries.
Anyone who knows his identity should call 105, quoting file number 201011/9236.
Extracted in full from: https://www.tvnz.co.nz/one-news/new-zealand/police-charge-seven-people-after-porirua-service-station-gang-brawl-man-stabbed