They were held after police found that they failed to change types of the work permits in their passports, said Ye Min from Aid Alliance Committee for Myanmar workers in Thailand. 
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Thai police detain Myanmar migrant workers in Tak

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Nongluck is a senior economic journalist covering the macroeconomics, real estate, and corporate investment strategies driving growth across Thailand and Southeast Asia.

Thai police detain Myanmar migrant workers in Tak

Police in Tak's Mae Sot district have detained 37 Myanmar migrant workers in Mae Sot, Tak province for breaking rules concerning their work permits, sources said Tuesday.

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