Trump vows 'fire and fury' on North Korea if threats continue

Defiant Donald Trump has warned Kim Jong Un's government to "get their act together" or face extraordinary trouble - suggesting he had been too mild when he vowed to unleash "fire and fury" on North Korea if it continued to threaten the US.

"Maybe that statement wasn't tough enough," the US president said, firing the latest salvo in the escalating exchange of threats between the nuclear-armed nations.