Any such test would further inflame regional tensions and follows Pyongyang's warnings in recent weeks that it stands on the brink of open war with Seoul.
South Korean government officials told the Yonhap news agency that they had received US satellite images of a train carrying a suspected Taepodong-2 missile to Dongchangri, near the Chinese border where nuclear-armed North Korea is building a launch pad.
South Korea's defence ministry said in November it estimated the Dongchangri facility was 80 per cent complete and Yonhap's sources said the communist country would be able to carry out a launch within two months.
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