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.
Thousands of impoverished Muslim Rohingya -- a minority unwanted by Myanmar's government -- and Bangladeshis brave a perilous sea and land trafficking route through Thailand and into Malaysia, Indonesia and beyond every year.
One boat was still stuck on a breakwater offshore but the others are believed to have fled to sea.
"We know that there are more boats out there that want to come in," Langkawi police chief Haritth Kam Abdullah told AFP, citing police intelligence.
Indonesian authorities said they intercepted a boat off the coast of the northwestern province of Aceh early today with estimates of at last 400 people aboard, a day after 573 people described by one official as "sad, tired and distressed" came to shore in Aceh.
The vessel discovered off Indonesia on Monday was still at sea, shadowed by the country's navy, said naval spokesman Manahan Simorangkir.
He said the vessel was damaged but afloat, and its captain had fled. The navy was supplying the ship with water and food but the spokesman said there were currently no plans to allow it to berth.
Aceh provincial search and rescue chief Budiawan, who like many Indonesians goes by one name, told AFP authorities were bracing for further arrivals.
"We are on standby and ready to rescue them when we receive an alert," Budiawan said.
He was among about 300 Bangladeshi men who were being fed and tended to at a police detention centre badminton court, most of them shirtless and looking thin, weak and haggard.
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