North Korea has suffered an internet shutdown for at least two hours, Chinese state media and cyber experts say, after Pyongyang blamed Washington for an online blackout earlier this week.
Xinhua news agency reported that North Korea's internet and mobile 3G network came to a standstill at 7.30am local time on Saturday in Pyongyang and had not returned to normal as of 9.30pm.
Xinhua's reporters in North Korea found that the internet was "very unstable" throughout the day, the report added.
Respected cyber security firm Dyn Research also said on Twitter that North Korea suffered a "country-wide internet blackout" on Saturday.
North Korea earlier in the day called US President Barack Obama a "monkey" for inciting cinemas to screen a comedy featuring a fictional plot to kill its leader, and blamed Washington for an internet blackout this week.
The isolated dictatorship's powerful National Defence Commission (NDC) threatened "inescapable deadly blows" over the film and accused the US of "disturbing the internet operation" of North Korean media outlets.
The earlier internet outage triggered speculation that US authorities may have launched a cyber-attack in retaliation for the hacking of Sony Pictures - the studio behind madcap North Korea comedy "The Interview".
Washington has said the attack on Sony was carried out by Pyongyang.
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