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 after two boards riddled with nails found in the Prince Creek network on June 15. The boards were covered with dirt and pine needles on the narrow, single-track trails. An observant rider spotted and removed the hazards. No one was reported injured.
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.