Several mountain bike riders have been injured after crashes while trying to avoid logs and rocks deliberately placed on a Nerang trail, police say.

They have released a comfit image of the man who they believe is responsible for placing the obstacles in the Nerang State Forest.

Police are searching for a saboteur who targets riders in forest on the Gold Credit:QPS

“The items placed on the bike trail appear to be strategically placed to force riders to either crash into them or crash whilst avoiding them,” Nerang Police Senior Sergeant Peter Gordon said.

“It is certainly concerning that riders have suffered injuries as a result of these incidents.