North Korea tests hydrogen nuclear device

North Korea has announced it successfully conducted a test of a miniaturised hydrogen nuclear device.

FILE: North Korea has announced it successfully conducted a test of a miniaturised hydrogen nuclear device.

SEOUL - North Korea said it had successfully conducted a test of a miniaturised hydrogen nuclear device on Wednesday morning.

The announcement of a test being conducted followed a 5.1 magnitude earthquake near its known nuclear test site.

Just hours after North Korea carried out a hydrogen nuclear test, South Korea is warning it will take all necessary measures to protect its people.

The North's leader Kim Jong Un made public statements a few weeks ago confirming that the country was developing a hydrogen bomb.

The nuclear test is the fourth by the isolated country, which is under U.S. and UN sanctions for its nuclear and missile programmes.

The White House has released a statement in the last half hour saying it is aware of Pyongyang's claims of a nuclear test.

It says while it cannot confirm the claims just yet - it condemns any violation of the United Nations Security Council resolution.