Kim Jong Un
North Korea leader Kim Jong Un smiles as he visits Sohae Space Center in Cholsan County, North Pyongan province for the testing of a new engine for an intercontinental ballistic missile in this undated photo released by North Korea's Korean Central News Agency (KCNA) on April 9, 2016. REUTERS/KCNA

North Korea has deployed one or two Musudan intermediate-range ballistic missiles on the east coast, possibly preparing for launch around April 15, the birthday of the country's founder, South Korea's Yonhap news agency reported on Thursday.

A mobile launcher was spotted carrying up to two Musudan missiles, Yonhap said citing multiple South Korean government sources.

The Musudan missile, with a design range of more than 3,000 kilometers (1,800 miles) is not known to have been flight-tested, according to South Korean defense ministry and experts.

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