Police in the Forest of Dean are investigating reports of off-road bikes being ridden anti-socially.
Nine incidents were reported to police between Friday 3 January and Sunday 5 January.
The off-road bikers have caused damage to woodland in Lydney, Coleford, Cinderford and Broadwell. T
They have also been spotted pulling wheelies and running red lights.
Police will be proactively patrolling the areas over the coming weeks.
