North Korea's political prisons growing?

Updated 7:37 PM ET, Wed December 4, 2013
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A satellite image of a village in the northern part of North Korean political camp 16 (Kwanliso) taken in September 2011. Amnesty International/DigitalGlobe
A year and a half later, in April 2013, the area appears to have undergone change, with new housing being recently added or under construction. The guard post in the immediate vicinity of the village allows for constant supervision of the prisoners and is indicative of the tight security within the political prison camp, says Amnesty International. Amnesty International/DigitalGlobe
In June 2010, an image of the political prison camp known as Kwanliso 16 shows a new facility under construction. Amnesty International/DigitalGlobe
In November 2012, the industrial facility appears to be operational and new support buildings are visible -- a sign of further investment in mining, agriculture and logging production facilities, according to Amnesty. Amnesty International/DigitalGlobe
A satellite image shows a checkpoint on the main road. Amnesty International said these images indicate that repression by the North Korean authorities has continued in spite of growing calls for the country to close its political prison camps. Amnesty International/DigitalGlobe
An administrative area of Kwanliso 16 in May, 2011. Amnesty International/DigitalGlobe
An image taken in May, 2013 indicates that housing in the area has been razed and reconstructed. Amnesty International said the prisoner population in Kwanliso 16 appears to have increased slightly. Amnesty International/DigitalGlobe
Two more housing units under construction close to the main entrance of Kwanliso 16. Each building has ten 4 x 3.5 meter units. Amnesty International/DigitalGlobe
The camp is surrounded by a double fence along its perimeter and numerous guard posts. Access is highly restricted through two gates on opposite sides of the political prison camp. Amnesty International/DigitalGlobe
In March 2011, logging is widely visible in the camp. Amnesty International/DigitalGlobe
An image from September 2013 shows that logging activities have been ongoing over a two year period. Amnesty International/DigitalGlobe
One of four satellite images taken of a probable furniture factory. Lumber piles changed over time, indicating production activity. Amnesty International/DigitalGlobe
Satellite images of Kwanliso 15 (Yodok Kwanliso), taken on the 26 March 2011 and 22 February 2012 show an administrative compound that was built during that period. The complex is likely to be a guard station or an administrative area to support logging activities. Amnesty International/DigitalGlobe