Washington — The US has officially accused North Korea of carrying out the massive WannaCry cyber attack that infected about 300,000 computers in 150 countries earlier this year. North Korea was widely suspected of being behind the computer virus and ransomware, which demanded payment to restore access. It was denounced as such by Britain, but the US had yet to follow suit. Homeland security adviser Tom Bossert made the announcement in a Wall Street Journal op-ed on Monday, and was expected to provide more details in a briefing with reporters early on Tuesday. "The attack was widespread and cost billions, and North Korea is directly responsible," he wrote. "We do not make this allegation lightly. It is based on evidence."

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