Hawke's Bay police are appealing for footage of dirt bikes being driven dangerously, after a spate of incidents in the weekend.
Multiple complaints were made about dirt bikes being ridden in Napier on footpaths and in supermarket car parks, police said in a statement.
Officers were working to identify those involved and wanted riders to know they would be taking action against anyone driving bikes in places they should not, or in an anti-social way.
That action could include seizing and impounding of bikes.
"Most dirt bike owners are responsible and aware they can't ride their bikes in reserves, sports grounds and on footpaths. But a few riders are giving the rest a bad reputation," the statement said.
"They are the ones driving at speed through parks, tearing up fields, riding in an anti-social manner and not wearing helmets which not only puts themselves at risk of serious harm, but also members of the community enjoying those public spaces."
Police were becoming increasingly frustrated with dirt bikes being ridden on the road, which was only allowed if the bike was roadworthy and had a warrant and registration.
"Those riding illegal bikes on roads and in community spaces can expect to be targeted and prosecuted."
They asked for anyone who sees dirt bikes being ridden illegally to get video or photos or to report a description of the driver.
"Police cannot be everywhere all the time and we need the public's assistance to combat this problem."
Information and evidence could be sent to police by email at HBDirtbikes@police.govt.nz, by calling police on 105 or by calling the anonymous tip line Crimestoppers, on 0800 555111.
Anyone with information about the identity of the riders involved or addresses where the dirt bikes are kept can e-mail or call 105.