North Korea says successfully conducted nuclear test

SEOUL (Reuters) - North Korea said it had successfully conducted a nuclear test on Monday, raising the explosive power and level of control of its nuclear device to a new level, its state media said.

"We have successfully conducted another nuclear test on May 25 as part of the republic's measures to strengthen its nuclear deterrent," the North's official KCNA news agency said.

(Reporting by Jack Kim; Editing by Jonathan Hopfner)