North Korea's major websites are back online Tuesday, after days of outages that came amid Washington's threat of a "proportional" action against Pyongyang over its alleged cyber-attack on Sony Pictures Entertainment.
   
North Korea's main propaganda websites, including Uriminzokkiri and Ryugyong, have been stable for more than 12 hours since Monday afternoon.
   
Those websites, whose servers are located in China, had been unstable since Nov. 23, when the North's Internet was completely down.
   
Meanwhile, access to other major websites, including the Korean Central News Agency and the communist party's official newspaper, the Rodong Sinmun, has been completely restored.
   
North Korea had experienced Internet outages for days after U.S. President Barack Obama vowed a "proportional" response to what he called "cyber vandalism."
   
The U.S. blamed North Korea for hacking Sony Pictures to stop the Christmas Day release of "The Interview," a lowbrow comedy movie involving a fictional plot to assassinate North Korean leader Kim Jong-un. 
   
North Korea has vehemently denied its involvement in the cyber-attack on Sony Pictures and offered to jointly conduct an investigation into the case with the U.S. government. (Yonhap)