North Korea is reportedly preparing to test-fire its longest-range missile - that could hit the US mainland - increasing tensions with South Korea.
A source quoted by Seoul's Yonhap news agency said US and South Korean intelligence agencies have recently spotted a train carrying a long cylindrical object believed to be a Taepodong-2 missile.
Launch preparations are likely to be completed in a month or two at a new west coast site, the source said. The defence ministry and National Intelligence Service refused to comment.
Japan's Sankei Shimbun newspaper said spy satellites had detected a large container capable of housing a missile being delivered to the site at Tongchang, about 40km south of the border with China.