CARBONDALE, Colo. - Federal authorities say they're still investigating sabotage on a mountain biking trail near Aspen last month.
The Aspen Times reports that the Bureau of Land Management is investigating two boards riddled with nails in the Prince Creek network on June 15. The boards were covered with dirt and pine needles on the narrow, single-track trails.
Cyclist Colin Osborn spotted and removed the hazards. No one was reported injured.
Osborn found the boards while riding the Creekside and Skillsaw trails.
A BLM spokesman says the agency will step up patrols on the popular trails.
The BLM's primary law enforcement activity there has been citing or warning people for camping too long.
BLM spokesman David Boyd says no other incidents have been reported.
However, 7NEWS reported in May that a strip of metal spikes was found on a trail in the Rampart Range area, south of Denver.
"The wire spikes were buried in the trail bed so that wheeled vehicles would be damaged and unsuspecting hikers could be injured," according to officials with the Pike National Forest.