From CNN's Barbara Starr
North Korea raised at least one Musudan missile into its upright firing position Wednesday, raising concerns that a launch was imminent, a U.S. official told CNN Thursday. It's not known by the U.S. why the regime did not fire the missile. The official cautioned that the raising of the missile could have been just a trial run to ensure the equipment worked or an effort to "mess" with the United States and its allies, who are watching for a launch at any time. The official declined to specify what type of intelligence led the United States to conclude the missile was in a firing position.