The Rohingya, a Muslim ethnic group in western Myanmar described by the United Nations as the most persecuted minority in the world, have crossed the border in waves over several decades.

About 32,000 are sheltered in camps administered by the United Nations, but hundreds of thousands more live undocumented in squalid, makeshift camps or scattered around southeast Bangladesh, vulnerable to human traffickers and exploited as cheap labor.

The population has swelled...
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