North Korean websites now accessible

North Korea's major websites were back online Tuesday after more than a month's outage.

North Korea's main websites have been stable for more than 12 hours since Monday afternoon, Yonhap News Agency reported.

Those websites, whose servers are located in China, had been unstable since Nov 23.

Meanwhile, access to other major websites, including the Korean Central News Agency (KCNA) and newspaper, the Rodong Sinmun, has been completely restored.

North Korea had experienced the outages amid Washington's threat of a "proportional" action against Pyongyang over its alleged cyber-attack on Sony Pictures Entertainment.

The US blamed North Korea for hacking Sony Pictures to stop the Christmas Day release of the movie, "The Interview," a comedy involving a fictional plot to assassinate North Korean leader Kim Jong-un.

North Korea has denied its involvement in the cyber-attack and has offered to jointly conduct an investigation into the case with the US government.