Ban said he has been discussing the emergency with regional leaders in Myanmar, Malaysia and Thailand, among others, and urged them to provide search and rescue operations and options for resettlement and reintegration.
"It's important to save human lives," he said on a visit to Hanoi, Vietnam. But it's also important "not to send them back to a dangerous circumstance or situation."
Four Malaysian navy ships began searching for boats Friday, according to navy chief Abdul Aziz Jaafar, who said three helicopters and three other ships were on standby.
The Malaysian search is a positive sign, but the country's operation is limited to the country's territorial waters.
More From This Section
A spokesman for the US Pentagon said Thursday that Washington was readying air patrols to aid in the search. A U.S. Embassy spokeswoman in Bangkok, Melissa Sweeney, told The Associated Press in an email Saturday that the offer of assistance was still awaiting clearance.
Last week, Malaysia and Indonesia announced they would provide temporary shelter to the migrants for up to one year, and the US has said it would settle some of them permanently.
Speaking Friday in Myanmar, US Deputy Secretary of State Anthony Blinken said the Rohingyas fleeing the predominantly Buddhist nation were risking perilous journeys and putting their lives in the hands of human traffickers because "they are in despair and don't see a future" at home.
The Rohingya, numbering at around 1.3 million, have been identified by the United Nations as one of the most persecuted minorities in the world. They have been denied citizenship and chased off their land in the latest bout of ethnic violence that left them with little access to education, medical care or freedom to move around.