North Korea got a taste of its own medicine Monday when its limited Internet access was cut off just days after the United States accused it of being behind the massive hack attack of Sony Pictures.
The hermit kingdom — which has four official networks connecting the country to the Internet, all of which route through China — began experiencing intermittent problems Sunday before going completely dark a day later.
"They are totally offline," said Doug Madory, director of Internet analysis at Dyn Research in Hanover, NH. "I don't know that someone is launching a cyberattack against North Korea, but this isn't normal for them. This is not like anything I've seen before."
President Obama had denounced the "cybervandalism" after US authorities pinned blame for the Sony attack on North Korea. He vowed to respond, but it was unclear when that would happen — or if there is any link between the president's promise and North Korea's 'Net crash.
Some key Web sites were back online late Tuesday.
North Korea has denied any responsibility for the Sony hack, conducted by a group calling itself the Guardians of Peace.
State Department spokeswoman Marie Harf said she could not confirm the cyberattack on North Korea and declined to say what steps would be taken in response to the Sony hack.
"We are considering a range of options in response," Harf told reporters. "Some will be seen. Some may not be seen."
Only a few thousand people have access to the Internet in North Korea. Compared with its four Internet networks, the United States has more than 152,000, according to Dyn Research.
The Sony attack was a massive breach that led to the leak of employees' personal information and a flood of embarrassing e-mails, prompting the company to cancel the Christmas release of the movie "The Interview," which lampooned an assassination plot against North Korean leader Kim Jong-un.
North Korea, meanwhile, ramped up the rhetoric with a threat Sunday night against the White House and the United States.
"Our toughest counteraction will be boldly taken against the White House, the Pentagon and the whole US mainland, the cesspool of terrorism, by far surpassing the 'symmetric counteraction' declared by Obama," the country's Policy Department said in a statement .
Additional reporting by Geoff Earle
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