Patrols are being stepped up in Dalby Forest, near Pickering, and Ingleby Greenhowe, near Guisborough, to deter illegal scrambling bikers, whose activities pose a danger to woodland visitors and wildlife sites.
The Forestry Commission say the problem has escalated recently - and although it is not as bad as it was a few years ago which resulted in multi-agency action to deter offenders - they are determined to work with partners to nip the problem in the bud.
The registration plates of some bikers have been recorded and handed to police.
Alan Eves, from the Forestry Commission, said: “There is a very good reason why we don’t allow unauthorised motorised vehicles on Forestry Commission land – they can be a menace to the environment and to other woodland users.
“Dalby in particular is a very popular woodland with walkers, horesriders and cyclist and motorbikers have been spotted deep in the forest.
“We would ask those engaged in this kind of activity to stop and think about they are doing. We are determined to work closely with the police and North York Moors National Park to tackle the problem.”
PC Andy Marsden, from North Yorkshire Police, added: “We will investigate reports of damage and nuisance and carry out regular patrols with partner agencies to combat this illegal nuisance. Anyone found riding or driving in the forestry on or off road can be dealt with in a number of ways from fixed penalty tickets, vehicle seizures and potentially arrest and detention.
“If anyone has information on illegal activities we would urge them to call their local Safer Neighbourhood Team officer or Crime Stoppers.”
You can call Crime Stoppers anonymously with information on 0800 555 111, the local police on 101, or the Forestry Commission on (01751) 472771.