REPUBLIKA.CO.ID, SINGAPORE -- North Korea's internet links have been restored, but it is not clear how stable they are, the US-based internet monitoring company Dyn said on Tuesday.

"The question for the next few hours is whether it will return to the unstable fluctuations we saw before the outage," Jim Cowie, chief scientist for the company, said in a telephone call. 

 North Korea, at the center of a confrontation with the United States over the hacking of Sony pictures, itself experienced Internet outages on Monday, a US company that monitors Internet infrastructure said earlier.

New Hampshire-based Dyn Research said the reason for the disruptions was not known but could range from technological glitches to a hacking attack. Several US officials close to the investigations of the attack on Sony Pictures said the US government was not involved in any cyber action against Pyongyang.

US President Barack Obama had vowed on Friday to respond to the major cyber attack, which he blamed on North Korea, "in a place and time and manner that we choose." 

Washington last Thursday requested China's help, asking Beijing to shut down servers and routers used by North Korea that run through Chinese networks, senior administration officials told Reuters. The United States also asked China to identify any North Korea hackers operating in China and, if found, send them back to North Korea. It wants China to send a strong message to Pyongyang that such acts will not be tolerated, the officials said.

By Monday China had not responded directly to the US requests, the officials added. In Beijing, the Chinese Foreign Ministry said on Monday it opposed all forms of cyber attacks and that there was no proof that North Korea was responsible for the Sony hacking.

North Korea has denied it was behind the cyber attack and has vowed to hit back against any US retaliation. The hackers said they were incensed by a Sony comedy about a fictional assassination of North Korean leader Kim Jong Un, which the movie studio has now pulled from general release.

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