IDAHO SPRINGS - The large scale search for a father and son from St. Louis Park who are missing in Colorado was called off Wednesday after one final push.

Alpine Rescue Team spokesman Bill Barwick said dozens of searchers had gone back into the mountains Wednesday after investigators were able to trace calls made when one of the men called a friend to tell them they planned to hike a mountain.

"We have found nothing so far,"' Alpine Rescue Team member Dawn Wilson said.

Relatives of the two men are now in Colorado, but they can't help search because of dangerous conditions.

Family spokesperson Andrea Bouzrara released the following statement Wednesday evening:

"The search has been thorough and comprehensive and it is in the judgment of the professionals that they have done all they can and they believe that they could not have survived. The McManus family wants to express their deep gratitude for all of those who were involved in the search for their loved ones."

Authorities say 51-year-old Damian McManus and 19-year-old Evan McManus were last heard from on April 2.

Barwick says searchers aren't sure the father and son were equipped for wintry conditions in the Rocky Mountains.

While the search has officially been called off, small groups from the Alpine Rescue Team will return to the area in the coming months to continue searching on a much smaller scale.

(KUSA-TV © 2014 Multimedia Holdings Corporation with The Associated Press)