Police reported a spate of incidents in Sussex in one week in July and have said they are now targeting all riders.

Insp Mark Armstrong said the bikes looked like "children's toys" but could cause serious injuries.

He said any riders caught on a mini motorcycle in a public place would be prosecuted and the vehicle seized.

"Their use on footpaths and in car parks is causing some alarm and potential danger to pedestrians," Mr Armstrong said.

'Noise and risks'

"They can travel relatively quickly and it is only a matter of time before someone is seriously hurt.

"They can only be used on private premises with the owners' permission and are regarded by the courts as motor vehicles."

He said the force had received complaints about people riding the bikes in car parks and that there was public concern about the noise and the risks involved.

People riding the vehicles in public places are being warned that they must have a crash helmet, a valid driving licence for that class of vehicle, and insurance within the classification of a moped and motorcycle.

Mini bikes used in a public place also have to be registered and taxed, and should comply with regulations regarding lighting, brakes and tyres, police have said.