Rohingya refugees wait for food and clothing in Tankhali, Bangladesh, on Friday.
The Bangladeshi government is set to clamp down on movements of hundreds of thousands of Rohinga Muslims fleeing Myanmar, but plans to build shelters for them.
Britain and Sweden are urging Myanmar's leader Aung San Suu Kyi to implement the recommendations of a report by the Advisory Commission on Rakhine State, led by former UN Secretary General Kofi Annan, which called on Myanmar's authorities to grant citizenship rights to the Rohingya.
A Rohingya refugee girl looks out as makeshift shelters become flooded due to heavy rain in Cox's Bazar, Bangladesh, September 17, 2017.
He said that the government and army had known everything about Arakan Rohingya Salavation Army (ARSA), a militant group, but chose not to take action against it.
Ethnic Rohingya have long faced discrimination in Myanmar and are denied citizenship, even though many families have lived there for generations.
This came just a day after Myanmar's de facto leader Aung San Suu Kyi called off plans to attend the UN General Assembly session in NY amid growing outrage over the unfolding Rohingya crisis.
Mr Mark Pierce, the Bangladesh chief of Save the Children charity, said Bangladesh and relief agencies are struggling to cope with new arrivals sheltering on roadsides, hills and open spaces close to existing camps around Cox's Bazar, which borders Myanmar. More than 400,000 Rohingya have fled their homes.
All eyes will be on the Nobel laureate as she addresses the nation on the crisis for the first time tomorrow, a high-stakes speech that many outside the country hope will explain her near silence on the tragedy.
They have been fleeing what the United Nations has now identified as a case of "ethnic cleansing".
Entire villages have been burned down by vigilante mobs and the military and people trying to flee have been shot, the organisation said.
According to latest estimates, about 391,000 Rohingya refugees have crossed into Bangladesh since violence erupted three weeks ago, making it one of the fastest growing refugee crises in recent years.
She expressed her wish to establish world peace in its true sense. Demonstrator Aisha Mirza bore a sign, made by her cousin, which read "Aung San Suu Kyi = Hitler rising".