According to the UN special rapporteur on human rights in North Korea, Tomas Ojea Quintana, about 15-hundred North Koreans are currently detained in China as "illegal migrants" and could face serious human rights violations when they're sent back.
He says this in a report he plans to present on Monday to the UN Human Rights Council, according to Radio Free Asia.
In the report, Quintana says China needs to apply the principle of "non-refoulement," according to which people are not returned to countries where they are likely to face torture and ill treatment.
Currently, North Korea's borders are closed, but they'll be at risk of being sent back once it's reopened.