SEOUL (Reuters) - A spokesman for North Korea s foreign ministry said on Thursday Pyongyang is not linked to any cyber attacks, the North s first response since the United States publicly blamed it for a massive worldwide cyber security breach.  As we have clearly stated on several occasions, we have nothing to do with cyber attack and we do not feel a need to respond, on a case-by-case basis, to such absurd allegations of the U.S.,  the spokesman said, according to the North s official KCNA news agency. The U.S. accusation was a serious political provocation against North Korea that Pyongyang would never tolerate, the spokesman said. The May cyber attack crippled hospitals, banks and other companies. 
North Korea rejects U.S. accusation, says it is not linked to any cyber attacks