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More than half of the new arrivals to escape violence in Myanmar's Rakhine state are living in the Kutupalong Expansion Site, which includes several makeshift settlements and land allocated by the government, he said.
"Nearly 570,000 people have received food assistance and nearly 310,000 people received health care," said Haq, adding that there are concerns about sanitation, with less than one quarter of sites hosting refugees having access to clean water.
A UN-supported humanitarian conference on Monday raised more than $344 million to fund critical relief programs for Rohingya refugees.
The exodus continues unabated, making the crisis the fastest growing refugee emergency in the world.
Since the crisis began, UN agencies have ramped up relief efforts, including conducting a massive immunisation campaign that inoculated more than 700,000 people against cholera, as well as providing food assistance to hundreds of thousands of refugees.