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North Korea is building its first road-mobile intercontinental ballistic missile (ICBM), an easily hidden weapon capable of hitting the United States, Washington Times reported. The missile could be a variant of North Korea’s new Musudan intermediate-range missile, first disclosed publicly in October 2010. China’s military recently deployed two new mobile ICBMs, the DF-31 and DF-31A. It is not known whether North Korea’s new mobile missile is based on Chinese technology.The Musudan uses an advanced liquid propellent called unsymmetrical dimethylhydrazine (UDMH) and nitrogen tetroxide (N204) that are easier to store in missiles.