The mass exodus of labourers -- who help keep major Thai industries such as agriculture afloat -- comes after a warning from Thailand's new military regime that illegal foreign workers face arrest and deportation.
"The number of Cambodians returning from Thailand into Poipet (the main Thai-Cambodian border crossing) in just over a week reached 157,000 by this morning," said Kor Sam Saroeut, governor of northwestern Banteay Meanchey province where the checkpoint is based.
At the crossing in Poipet -- a bustling border town home to several large businesses, casinos and hotels -- a few hundred Cambodian migrants arrived in Thai military trucks and police cars today morning.
A batch of migrants who crossed the border overnight were waiting under a handful of tents propped up to provide the returnees with some shelter as they waited for transport to travel on to their homes in interior provinces.
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The foreign affairs ministry has said authorities attach "great importance" to the role migrant workers play in contributing to Thailand's economy.
The Cambodian Ambassador to Thailand Eat Sophea was due to meet the Thai foreign affairs ministry permanent secretary Sihasak Phuangketkeow today morning for talks where they are expected to discuss the Cambodian worker crisis.
In the past Thai authorities have turned a blind eye to illegal labourers because they were needed when the economy was booming.