North Korea is to cut all relations with South Korea, Pyongyang’s official news agency reports.

KCNA said the North was also expelling all South Korean workers from a jointly-run factory north of the border.

The move comes after an international report blamed North Korea for sinking a South Korean warship.

Pyongyang denies it torpedoed the Cheonan near the inter-Korean maritime border on 26 March, killing 46 sailors.

South Korea says it plans to refer North Korea to the UN Security Council, and is seeking a unified international response to the incident.