American human rights investigator David Hawk said Sunday in Tokyo there should be a plan for dismantling North Korea's notorious political prison camps, not just the country's nuclear facilities.

Speaking at the International Conference for the Abolition of Concentration Camps in North Korea, a meeting sponsored by Japanese human rights group No Fence in North Korea, Hawk said, "There should also be international thought and attention not only to disabling and dismantling the nuclear production facilities at Yongbyon, but also to disable and dismantle the prison camps in North Korea."

The group estimates there are as many as 300,000 political prisoners held in labor camps in remote regions of North Korea, with many subjected to torture and summary execution.