North Korea is preparing for a possible test of an intercontinental ballistic missile with the potential to hit the US, according to Washington officials.

A senior official said there were "enough indications" to suggest that Pyongyang was getting ready to fire a Taepodong-2 missile from a launch pad in eastern North Korea. It would be the Stalinist state's first test of a longer-range missile since 1998 when Pyongyang generated an international crisis by unexpectedly firing an intermediate-range Taepodong-1 over Japan.