The United States has backtracked somewhat on its previous assessment of North Korea's recent nuclear test, CNN reported Thursday. While Washington originally expressed skepticism over Pyongyang's claims that it tested a hydrogen bomb during the January 6 test, it now believes North Korea might have attempted to test components of a hydrogen bomb after further review and analysis of the latest intelligence information, officials told the news network. A U.S. official directly familiar with the latest assessment said there may have been a partial, failed test of some type of components associated with a hydrogen bomb. ...