Satellite imaging shows North Korea might be closing missile engine trials for an intercontinental ballistic missile (ICBM), commented a US think tank on Wednesday. If this is true, this will bring the entire United States of America into range, raising threat levels. Tests were carried out throughout this year but these were interpreted in accordance to the US-South Korea military exercises, but North Korea has not shown they have been able to master the ICBM re-entry technology.
More info : BBC News: North Korea missile program
Summary : North Korea threatens white house