North Korea top suspect for WannaCry attack, says ex US security chief

Former head of Homeland Security was attending a counter-terrorism conference in Slovakia when he accused North Korea of participation in cyber-attack.North Korea may have been behind the ransomware cyber-attack on the NHS and up to 100 countries including the UK, a former head of the US Department of Homeland Security has claimed.Michael Chertoff, who served under George W Bush from 2005 to 2009, said that agents or allies of the Pyongyang regime were the most likely suspects for the hacking of