Denying responsibility for a major hack on Sony Pictures, North Korea has proposed a joint investigation with the U.S. but promised “serious consequences” should its offer be rejected.

On Friday, the FBI said it had concluded North Korean responsibility because of several similarities in the malware code, the computer control network used and the software tools used against Sony and that used in previous attacks in South Korea that had been blamed on North Korea.

North Korea’s Ministry of Foreign Affairs, however, said in a statement Saturday that it needed to see “clear evidence” and said comparisons with previous cyberattacks were irrelevant to the Sony case.

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