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ESTES PARK - A scaled-back search continues for a Texas man who is believed to be missing in Rocky Mountain National Park.

Troy Green of San Antonio had planned to attend a conference in Denver, about 65 miles southeast of the park.

His wife notified police when she didn't hear from him Thursday.

The 39-year-old man didn't arrive at the conference as planned Friday, but park rangers found a vehicle that matched his rental car at the park's Bear Lake parking lot early Friday.

Rangers heard from two witnesses who said they spoke with Green on Thursday, but they did not see where he went.

Witnesses said he seemed to be prepared for winter weather with snow pants, a down jacket, gloves and a face mask.

Dozens of people searched for Green throughout the weekend.

"Unfortunately, with all of these search efforts we've not received any new information or clues that have given us any information or direction. So beginning this morning, park staff has decided to scale back," Kyle Patterson, spokesperson for the park, said on Monday.

Green's family tells park officials he was not an experienced winter outdoorsman.

"Searchers have been dealing with very deep snow over the last couple of days and significant avalanche conditions. with these kinds of winter conditions, day after day, certainly we're extremely concerned," Patterson said.

Anyone with information on Green, or who visited Bear Lake on Thursday or Friday, is asked to call (970) 586-1204.