A top UN official says "crimes against humanity" are being committed by the military and police against Myanmar's Rohingya Muslim minority.
The UN's special rapporteur for human rights in Myanmar, Yanghee Lee, was speaking as part of a joint media news.
Aung San SuuKyi, who has been in power almost a year, declined an interview.
A spokesman for her party said the allegations were "exaggerated" and an "internal" not "international" issue.
Ms Lee has not been given free access to the conflict area in Myanmar. But after speaking to refugees in Bangladesh she told media that the situation was "far worse" than she expected.
More than 70,000 Rohingya - a Muslim minority group from Myanmar - have fled to Bangladesh in the last few months, after a militant attack in October triggered a military crackdown.