Internet connections across North Korea went down on Monday night, as the fallout from the Sony hack continued.
The reason for the outage is not known at this stage, but fingers will be pointed at the US government, which has openly accused North Korea of orchestrating the Guardians of Peace attack on Sony.
Reuters cites a network monitoring company called Dyn as having first spotted the downtime. The firm said that it could not identify the cause, but explained that it started as a blip in places before going down totally.
"We're yet to see how stable the new connection is," Dyn told the news agency. "The question for the next few hours is whether it will return to the unstable fluctuations we saw before the outage."
The US government has rounded on North Korea, blaming it for the attack and threats on Sony Pictures.
The FBI thanked Sony for assisting in the investigation, saying that the company reported the incident in good time.
"Sony reported this incident within hours, which is what the FBI hopes all companies will do when facing a cyber attack," the FBI said in a statement.
"Sony's quick reporting facilitated the investigators' ability to do their jobs, and ultimately to identify the source of these attacks.
"As a result of our investigation, and in close collaboration with other US government departments and agencies, the FBI now has enough information to conclude that the North Korean government is responsible for these actions."
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