N Korea says ICBM can carry 'large, heavy nuclear warhead'

North Korea's intercontinental ballistic missile is capable of carrying a "large, heavy nuclear warhead", its official news agency said today.

The device, launched yesterday in a watershed moment for Pyongyang's weapons ambitions, was capable of reaching Alaska, according to outside experts, and the Korean Central News Agency quoted leader Kim Jong-Un as saying the confrontation with the US had entered the "final stage".