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In page Human rights in North Korea:

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Initially, there were around twelve political prison camps, but some were merged or closed (e.g. Onsong prison camp, Kwan-li-so No. 12 was closed down following an unsuccessful riot in 1987 where around 5,000 prisoners were killed[8]). Today there are six political prison camps in North Korea (see below). Most of the camps are documented in testimonies of alleged former prisoners, and coordinates and satellite images of all are available.[citation needed]