Yanghee Lee told reporters in Seoul, where she is based, that she couldn't make a definitive declaration about genocide until a credible international tribunal or court had weighed the evidence, but "we are seeing signs and it is building up to that."
Her briefing described her recent visit to refugee camps in Bangladesh and other areas in the region to discuss the Rohingya, a percecuted Muslim minority in Myanmar.
Nearly 700,000 Rohingya have fled their villages into Bangladesh since the Myanmar military's crackdown following Aug 25 attacks by Rohingya insurgents. The government of Myanmar has refused her entrance to the country.
She said such reports must be investigated, "and this is why we've called for a fact finding mission ... and access for international media to" the areas in northern Rakhine state where the Rohingya live.
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Lee said that Myanmar's actions were "amounting to crimes against humanity."
"These are part of the hallmarks of a genocide," she said.
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