Newly-released satellite images show that North Korea's prison camp system, where detainees are subjected to forced labor, torture, starvation, rape and death, may be expanding.
Up to 120,000 men, women and children are imprisoned in the gulags, known as "kwanliso" in Korean, according to the United Nations.
Pyongyang officially denies that the camps exist, but multiple human rights groups have documented their ongoing operation via survivor testimony and satellite imagery.
On Tuesday, Washington-based Human Rights in North Korea (HRNK) released images of Camp No. 25, a camp near Chongjin, on North Korea's northeast coast.
According to HRNK, the map underwent an expansion before 2010, when it almost doubled in scale, and has continued to operate at its larger size.
"Our satellite imagery analysis of Camp No. 25 and other such unlawful detention facilities appears to confirm the sustained, if not increased importance of the use of forced labor under Kim Jong-un," HRNK executive director Greg Scarlatoiu said in a statement.
HRNK's report comes after separate analysis by Amnesty International this month concluded that Pyongyang "is continuing to maintain, and even invest, in these repressive facilities."
"These camps constitute the cornerstone of the country's large infrastructure dedicated to political repression and social control that enables widespread and systematic human rights abuses," Amnesty said in a statement.
"Assessments of the satellite images of two political prison camps -- known as kwanliso -- collected in May and August show the addition of new guard posts, upgrading of a reported crematorium, and ongoing agricultural activities."
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