Update: The Youtube channels Stimmekoreas and Uriminzokkiri have since been reinstated by Google since this article was published.

YouTube removed several major North Korea-related channels on Friday “for violating YouTube’s Community Guidelines”, notices on the former channels reveal, amid a broader U.S. crackdown on the country following its sixth nuclear test.

The channels all regularly published content related to North Korea or videos of North Korean state media-produced content, and were used extensively by researchers following the country on a day-to-day basis.

“The channel was 7 years old, it was a great way to watch the DPRK’s point of view