A migrant who arrived today by boat, part of a group of Rohingya Muslims and Bangladeshis, receives medical assistance at an aid station in Kuala Langsa in Indonesia's Aceh Province.
Nearly 800 "boat people" were brought ashore in Indonesia on Friday, but other vessels crammed with migrants were sent back to sea despite a UN call to rescue thousands adrift in Southeast Asian waters with dwindling supplies of food and water.
The United Nations this week urged governments to fulfil an obligation to rescue those at sea and "keep their borders and ports open ... to help the vulnerable people who are in need".
However, there have been few signs that Southeast Asian nations are collaborating to avert a humanitarian crisis, in contrast with Europe, where countries are working together to deal with a tide of migrants crossing the Mediterranean.
Thai Prime Minister Prayuth Chan-ocha, whose government has announced a regional meeting on the crisis for May 29, said his country did not have the resources to look after the migrants.
"As there are many of them, we cannot look after them properly. Where will we put them?" Prayuth told reporters.
"Right now we have to find a place for them to stay. In the future, if many more of them come, it will cause a problem. They will steal the jobs and livelihoods of Thais."
Indonesia wanted to keep the boats out of its waters to dissuade more from coming, said military chief General Moeldoko.
"We will try to prevent them from entering our territory otherwise it will create social issues," Moeldoko told reporters after meeting President Joko Widodo in the capital Jakarta. "If we open up access, there will be an exodus here."
The United States last year downgraded Thailand and Malaysia to its list of the world's worst centres of human trafficking, dumping them in the same category as North Korea and Syria.