Updated

The parents of the only known U.S. prisoner of war say they are "cautiously optimistic" about reported renewed efforts to win his freedom.

U.S. Army Sgt. Bowe Bergdahl was captured more than four years ago in Afghanistan and is believed to be held in Pakistan.

The Washington Post reported (http://tinyurl.com/ld3y59o ) Monday that the Obama administration is seeking to resume talks with the Taliban in hopes of exchanging Bergdahl for imprisoned members of the group. The Post cited current and former officials who spoke on condition of anonymity to outline parts of a strategy they described as a last-ditch effort.

In a statement Tuesday, the Idaho soldier's parents said they welcome the development. Bob and Jani Bergdahl say they hope all sides take this opportunity seriously.