Cyclists using trails at the Tuggeranong Hill Nature Reserve have been targeted by vandals, with fencing wire discovered strung across several pathways in attempts to dismount riders.
The thick wire was discovered in two locations along one of the trails in the nature reserve on Saturday morning by a Tuggeranong resident out on a walk, who notified police.
A spokesman for ACT Policing confirmed officers are investigating the incident.
"ACT Parks and Conservation have been notified and enquiries in relation to this incident are continuing," the spokesman said.
There have been no reports of inuries as a result of the wires.
The resident who discovered the wires on the trails, who declined to be named, said the wires weren't visible unless they were viewed at a certain angle.
"This is very concerning," the resident said.
"If a bike was riding along, they wouldn't see the wire and they would be knocked off."
The wires were strung between two trees and were then removed by police.
Anyone with further information is urged to contact Crimestoppers on 1800 333 000.