The United Nations Security Council will hold an urgent meeting to discuss violence churning through western Myanmar, after the UN’s rights chief warned that “ethnic cleansing” appeared to have driven over 300,000 Rohingya Muslims from the country.

Rakhine State was plunged into crisis after Rohingya militants attacked police posts in late August, prompting a military backlash that has sent nearly a third of the Muslim minority population fleeing to Bangladesh.

Exhausted Rohingya refugees have told stories of running from soldiers and Buddhist mobs who burned their villages to the ground and killed civilians indiscriminately, while the government blames militants for the arson.

International pressure tightened on Myanmar’s government Monday, as United Nations rights chief Zeid Ra’ad Al Hussein said the violence seemed to be a “textbook example of ethnic cleansing”.

Hours after the warning, the Security Council announced it would meet Wednesday to discuss the crisis, which has heaped global opprobrium on Myanmar’s civilian leader Aung San Suu Kyi.

A Nobel peace laureate, Suu Kyi is the focal point of anger from rights groups and a stream of fellow Nobel laureates for her failure to speak up for the Rohingya minority, who are denied citizenship and have suffered years of persecution in Buddhist-majority Myanmar.