Navi Pillay, who heads the U.N. Office of the High Commissioner for Human Rights, said the scale and viciousness of the abuses being perpetrated by both sides almost defies belief, and is being well documented by an expert U.N. panel of investigators.

"They've produced massive evidence," she told a news conference. "They point to the fact that the evidence indicates responsibility at the highest level of government, including the head of state."

But Pillay said the lists of suspected criminals are handed to her on a confidential basis and will remain sealed until requested by international or national authorities for a "credible investigation," and then possibly used for prosecution.

Pillay said she worries about striking the right balance in determining how long to keep the information secret. The lists "rightly belongs to the people who suffered violations," she said, but they also must be kept sealed "to preserve the presumption of innocence" until proper judicial probes can be done that could lead to trial.

Pillay said Syria and North Korea '€” the two countries being probed by a U.N. investigative panel '€” represent two of the world's worst human rights violations, but she also cited concerns with Central African Republic, Bangladesh and other regions.

Other places that require the world's attention, she said, are the large-scale expulsions of migrants from Saudi Arabia, the high number of migrant laborer deaths building World Cup stadiums in Qatar, and continuing political exploitation of xenophobia and racism in Europe and other developed regions.

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