The number of Rohingya refugees crossing from Myanmar into Bangladesh has surged, the UN says, with more than 35,000 new arrivals identified in the last 24 hours.
More than 123,000 Rohingya are now said to have fled violence in Myanmar’s Rakhine state since 25 August.
The conflict was triggered by an attack by Rohingya militants on police posts.
This sparked a military counter-offensive that has forced a flood of Rohingya civilians from their villages.
The Rohingya are a stateless mostly Muslim ethnic minority who have faced persecution in Myanmar (also called Burma). Many of those who have fled describe troops and Rakhine Buddhist mobs razing their villages and killing civilians in a campaign to drive them out.
The military says it is fighting against Rohingya militants who are attacking civilians.
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Independently verifying the situation on the ground is very difficult because access is restricted, but since the police-post attacks Rohingya families have been streaming north into Bangladesh.
The UN says it is not clear exactly when the latest refugees arrived, but said the number of new arrivals needing food and shelter had surged dramatically.
Two main UN camps for them are now full, so people are sleeping outside or building shelters on open ground and along roads, a spokeswoman said. Many are in dire need of food and water.
“We fled to a hill when the shooting started. The army set fire to houses,” Salim Ullah, a farmer from Myanmar’s Kyauk Pan Du village, told Reuters news agency as he arrived in Bangladesh.
“We got on the boat at daybreak. I came with my mother, wife and two children. There were 40 people on a boat, including 25 women.”
Fighting appeared to be continuing in Rakhine, a UN situation report said, with smoke seen at at least 15 points close to the Bangladesh border.
Thousands of Buddhist villagers in Rakhine are also reported to have fled south. One woman told BBC Burmese she saw Rohingya militants attack people in her village with swords and ran for her life.
The refugee surge comes amid mounting concern in Muslim nations over the plight of the Rohingya.
“The security authorities need to immediately stop all forms of violence there and provide humanitarian assistance and development aid for the short and long term,” said Indonesia Foreign Minister Retno Marsudi.
Ms Retno met Myanmar’s de facto leader, Aung San Suu Kyi, on Monday and was due in the Bangladeshi capital today.
Indonesia is one of several nations where there have been protests over the issue. Pakistan and Malaysia have spoken out, and the Maldives has suspended trade with Myanmar. The Turkish president called Ms Suu Kyi to raise concerns about human rights abuses, Turkish media said.
Chechnya and Indian-administered Kashmir have seen protests and Kyrgyzstan has postponed an Asian Cup football qualifier with Myanmar, citing possible protests.
On Monday, a senior UN human rights official said it was time for Ms Suu Kyi to step in to protect the Rohingya.