Searchers are scaling back the hunt for a Texas man who disappeared while exploring trails around Bear Lake in Rocky Mountain National Park, according to park service officials.

Troy Green was last week hiking Thursday as part of a side trip while visiting Denver for a conference. Authorities began searching after finding his rental vehicle parked near the lake on Friday, but snow has hampered their efforts over the weekend.

On Monday, officials said they were pulling back because of safety concerns and a lack of leads.

Plane and helicopter searchers noticed a number of avalanches in the area, but there were no signs they were caused by people, officials said. Futher plans includie using small teams of rangers to check challenging terrain in the Bear Lake and lower Tyndall Gorge areas.