A screenshot shows a WannaCry ransomware demand, provided by cyber security firm Symantec, in  Mountain View, California, May 15, 2017.
A screenshot shows a WannaCry ransomware demand, provided by cyber security firm Symantec, in Mountain View, California, May 15, 2017.

TOKYO - A North Korean ambassador to the United Nations says the U.S. claim that Pyongyang was behind the Wannacry ransomware attack earlier this year is a baseless provocation and demanded Washington back up its accusations with evidence.

The North's U.N. ambassador in charge of U.S.-related issues says North Korea believes Washington is using the allegation to create an "extremely confrontational atmosphere."

Pak Song Il told The Associated Press in a telephone interview from New York late Monday: "If they are so sure, show us the evidence."

The WannaCry ransomware attack infected hundreds of thousands of computers worldwide and crippled parts of Britain's National Health Service in May.