North Korea vows to retaliate over ’reckless’ US ransomware accusation

North Korea has said a US accusation that it was behind a major ransomware attack was a "grave political provocation" and vowed to retaliate.

Homeland security adviser Tom Bossert wrote in the Wall Street Journal on Monday that North Korea will be held accountable for May’s WannaCry ransomware attack that infected hundreds of thousands of computers worldwide and crippled parts of the UK’s NHS.