Boards pierced with nails have been found on two western Colorado trails popular with mountain bikers.
The Glenwood Springs Post Independent reported Wednesday the boards were found on the Creekside and Skillsaw trails in the Prince Creek area.
The federal Bureau of Land Management says one of the boards was found on public land and one was on a section of trail that crosses private land.
There was no word on whether the nails caused any damage or injuries.
BLM spokesman David Boyd says no other incidents have been reported.