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The US says it is seeing no signs of increased military activity in North Korea, even as it positioned a warship close to the Korean peninsula, BBC reported. 

The US had not "seen action to back up the rhetoric", an official said.

But in the latest show of military hardware, officials said a destroyer capable of intercepting missiles was being moved to the Korean coast.

North Korea said on Saturday that it was entering a "state of war" with South Korea.

"Despite the harsh rhetoric we're hearing from Pyongyang, we are not seeing changes to the North Korean military posture," White House spokesman Jay Carney said.

He added that the US was ready to take prudent measures if needed.

Tensions are high in the Korean peninsula following North Korea's third nuclear test in February, and multiple threats in recent days from Pyongyang against US and South Korean targets.

North Korea has been angered both by UN sanctions imposed after its nuclear test in February and joint US-South Korea annual military drills.