The junta, which took over in a coup on May 22, denied there was a crackdown on migrants, despite having earlier announced that illegal migrant workers would be arrested and deported.
"The Thai junta's new regulations have caused a massive flight of migrant workers, who have long endured abuses from officials and unscrupulous employers," said Brad Adams, Asia director at Human Rights Watch, a US-based organisation.
"The junta needs to reverse this disaster by quickly putting into place genuine reforms that would protect migrant workers' rights, not threaten them."
DPA