Muhammad Shorif, a 16-year-old Muslim Rohingya from Myanmar, dreamed of one day being a doctor. After fleeing a dismal upbringing in a refugee camp, he embarked on a dangerous sea voyage, only to find himself stranded on Indonesia's farthest shores.

The teenager had hoped to reach Malaysia where he would join his uncle, receive an education and start a new life far from the discrimination he suffered in his homeland.

Thousands of migrants believed to be stranded at sea without food and water could die unless Southeast Asian governments act urgently to rescue them, migrant groups and the U.N. warned Tuesday.

Underscoring the concern, a migrant organization said a vessel was adrift somewhere near the Thai or Malaysian coast with around 350 people -- including women and children -- but no food or water, while Thailand called a regional summit on the issue.

Myanmar authorities on Monday described Bangladesh as "the root" of the migrant crisis facing the region, after hundreds of people -- many from the Muslim Rohingya minority -- were found adrift at sea.

Nearly 2,000 people from Myanmar and Bangladesh had been rescued or swum to shore in Malaysia and Indonesia by late Monday, after people smugglers apparently abandoned them in boats.

They washed up on Indonesia's far west coast "sad, tired and distressed" after a treacherous high-seas journey: hundreds of Rohingya migrants from Myanmar and Bangladesh, with children in tow, in search of a better life.

They were never supposed to wind up in Indonesia's Aceh region, said one Muslim Rohingya aboard the wooden boat which arrived at the weekend.

Nearly 2,000 boat people from Myanmar and Bangladesh have been rescued or swum to shore in Malaysia and Indonesia, authorities said Monday, warning that still more desperate migrants could be in peril at sea.

The spate of arrivals comes as Thailand, a key stop on a Southeast Asian people-smuggling route, cracks down following the discovery of mass graves that has laid bare the extent of the thriving trade.

Rescuers Sunday brought ashore 469 migrants from Myanmar and Bangladesh after their wooden boat arrived off Aceh in northwest Indonesia, an official said.

"We received a report from fishermen this morning that there were boat people stranded in the waters off north Aceh," Aceh provincial search and rescue chief Budiawan told AFP.

Thailand's junta chief Friday called for Malaysia and Myanmar's help in stamping out the region's thriving human trafficking trade following the discovery of remains from dozens of migrants.

Prime Minister Prayut Chan-O-Cha said he had asked his foreign ministry to seek a three-way meeting with counterparts from the neighboring countries before the end of May.

Thai authorities on Thursday issued 10 more arrest warrants against people suspected of human trafficking, as part of a blitz on camps used by people-smugglers sparked by the discovery of dozens of migrant remains.

National police chief Somyot Poompanmoung said officers were working to clear all camps within 10 days following an order by the prime minister, but did not provide details of how many sites he believes are located across southern Thailand.

Three local Thai officials and a Myanmar national have been arrested on suspicion of human trafficking after the remains of 26 migrants were found in a mass grave in southern Thailand, police said Monday.

The decomposed bodies of migrants thought to have come from Myanmar or Bangladesh were exhumed over the weekend at an abandoned jungle camp in the Sadao district of Songkhla province.

Heavily armed separatist rebels have ambushed a paramilitary convoy in India's remote northeast, killing eight soldiers and injuring six, officials said Monday.

The militants opened fire on the troops before exploding a small bomb during the attack on Sunday in underdeveloped Nagaland close to the border with Myanmar, the state's police chief said.