Local authorities are hunting down motocross bikers who trespassed and damaged the historic Toh Luang cave in Ao Luk district on Sunday.
A survey of the cave interior was jointly conducted yesterday by Royal Forestry Department officials and local administrative organisation representatives.
Local residents said they saw a group of motocross bikers from out of town enter the cave and raced on an obstacle course around the stalagmites.
The survey found some stalagmites and stalactites were damaged.
Tyre marks were also visible on ancient paintings on the cave wall.
The Toh Luang cave was declared a significant ancient site by the Fine Arts Department (FAD) on Sept 16, 2016.