Police have impounded four cars and arrested two people following a large tangi in Porirua on Monday.
A group of more than 120 cars travelled from Waitangirua to Plimmerton in the early afternoon for an 18-year-old who was killed in a crash last week. Stuff reports dozens of people were wearing Mongrel Mob insignia.
After appealing for information from the public on Monday, police now say they've found "a number of potential offences", particularly in relation to dangerous driving.
"Police have impounded four cars as a result of offending observed during the procession," a spokesperson says.
"Two people have been arrested to date - one person for disorder and a second person who had an active warrant to arrest."
Police say they aren't ruling further arrests or seizing more cars.
"We would like to thank all those members of the public who have been in touch to report possible offending," they say.
"The information provided by those people will form part of our enquiries."