"Anonymous Korea" claimed to take down several North Korean state websites Saturday, March 30 just hours after North Korea said it has entered into a "state of war" with South Korea, Mashable reports.

North Korea's main official state website was back up and running, as of Noon Eastern Time on Saturday. But Mashable says it was still unable to access three of the five listed websites that Anonymous Korea claimed to have attacked.

The attacks appear to be as part of an online hacking effort dubbed "#OpNorthKorea."

Uriminzokkiri, a North Korean news and propaganda site, was also back up after a reported hack.

The site for North Korea's official central news agency appeared unaffected Saturday.

The cyberattacks against North Korea also happened just a day after the country claimed to have rockets aimed at U.S. targets.

Earlier this month, South Korean officials suspected that North Korea may have instigated attacks against three banks and two broadcasters