North Korea’s connection to the Internet appears to have been cut off again on Wednesday.

Dyn Research, a company that analyzes the connectivity of networks and service providers around the world, said the North’s access to the Internet was disconnected at 12:41 a.m. and was restored after an hour.
 
The connection failure came just a day after the North’s four official networks connecting the country to the Internet, provided by China Unicom, went dark. The connection was restored after some ten hours but the North’s access to the Internet remained unstable.  
 
It has yet to be determined what caused the disconnections. Some observers suspect that the U.S. is behind the latest incident as U.S. President Barack Obama had mentioned over the weekend the possibility of a “proportional response” to the North’s hacking into the computer system of Sony Pictures Entertainment.
 
At the State Department, deputy spokeswoman Marie Harf told reporters that Obama’s remarks of potential response “are separate and apart from” what has been seen over the last 24 hours.
 
Some foreign media raised the possibility that China was involved in the North’s Internet problems. The Chinese Foreign Ministry denied such reports saying they are based on groundless rumors.