(CNN) - The Obama administration calculates it’s likely North Korea may test fire mobile ballistic missiles at any time, based on the most recent intelligence showing Pyongyang probably has completed launch preparations, a U.S. official said Tuesday.

The administration believes a test launch could happen without North Korea issuing a standard notice to commercial aviation and maritime shipping warning them to stay away from the missile’s path, according to the official, who declined to be named because of the sensitivity of the information.

He cautioned most of the information comes from satellite imagery, so it’s impossible to reach a definitive conclusion because the United States has no means to gather information on the ground.