Satellite image shows what Amnesty International calls 20 possible guard posts in North Korea's Ch'oma-Bong valleyGENEVA (Reuters) – North Korea has built a huge "safety perimeter" around a camp for political prisoners, limiting movement in nearby villages as a part of its "basic repression" of its individuals, Amnesty World mentioned on Thursday. The reclusive usa's network of political jail camps is believed to hold at least 200,000 folks and has been the scene of rapes, torture, executions and slave labor, U.N. Excessive Commissioner for Human Rights Navi Pillay stated in January. Diagnosis of recent satellite images of the realm close to Camp No. …