Police have seized four vehicles following a tangi in Hawke's Bay earlier this week.
Hawke's Bay commander inspector Lincoln Sycamore appealed for the public's help on Wednesday after a "large gang tangi caused significant congestion" on State Highway 2 south of Pakipaki on Tuesday.
A team was set up dedicated to following up on reports of traffic offences, such as dangerous driving and burnouts. It wanted any video footage of the event and confirmed some attendees had already been arrested for allegedly breaching bail conditions.
"Initial enquiries suggest some motorists engaged in dangerous behaviour that put themselves and others at risk."
On Friday afternoon, Hawke's Bay area prevention manager inspector Martin James said four vehicles have now been seized after police followed up on reports of offences.
"A dedicated team continues to view video footage and photographs in relation to this activity. Police are committed to holding those responsible for this anti-social behaviour accountable."
The procession received national attention after Simeon Brown, National's police spokesperson, shared an image of the Mongrel Mob gang members riding their motorcycles on both sides of the road and holding up traffic.
"Unbelievable. Another gang funeral in Hawkes Bay where gang members were able to take over the road. This should not be tolerated," he wrote.
Waikato Mongrel Mob public relations representative Louise Hutchinson said his comments were "culturally insensitive" and offensive to the family of the man who died.
She set up a petition to have Brown sacked, accusing him of inciting racial division "by ignoring that tangihanga is part of enduring Māori ceremony".
But National wasn't backing down.
"If the gangs are trying to get me sacked, I must be doing something right," Brown told Newshub on Thursday.
National leader Judith Collins said: "You know National is on the right side of law and order when the Mongrel Mob is petitioning for our MPs to be sacked, while Government Ministers are popping into their gang pads for lunch."
Collins revealed to The AM Show on Wednesday morning that Brown had received death threats after his social media posts about the funeral.
"He's concerned - as am I... they used words like, they said they would 'pop him' - which I think that means to shoot him."
Brown told Newshub he received "a number" of threatening messages on Tuesday night, which he has taken to the police and they are taking "seriously".
Police still want to hear from anyone with information, images or footage of the event. They can get in touch in person, online or by calling 105 and referencing Operation Stone.
Information can also be provided anonymously by calling Crimestoppers on 0800 555 111.
