About 515,000 Rohingya have arrived in Bangladesh since attacks by Rohingya militants in August triggered a sweeping Myanmar military offensive that the United Nations has branded ethnic cleansing, a term the government rejects.
The refugees joined 300,000 Rohingya who were already there.
The Myanmar government says its forces are fighting insurgents of the Arakan Rohingya Salvation Army who claimed responsibility for Rakhine state attacks on about 30 police posts and an army camp on August 25, which led to the crackdown. The government has also rejected allegations of arson, rape and arbitrary killings levelled against its security forces.
The Rohingya have walked for days over mountains and through rivers, and taken boats across the sea to escape to overstretched Bangladeshi camps.
Scrambling to cope with the influx to the camps, aid groups have appealed for a life-saving $434 million over the next six months to help 1.2 million people including the Rohingya refugees and 300,000 Bangladesh host communities.
Western critics have accused Myanmar leader Aung San Suu Kyi of not speaking out for the Muslim Rohingya, who have long complained of persecution. Buddhist-majority Myanmar regards the Rohingya as illegal migrants from Bangladesh and denies them citizenship, even though many families have lived there for generations. Some have called for Suu Kyi’s 1991 Nobel Peace Prize to be revoked.