Five officials have been implicated in allegedly issuing hundreds of fake ID cards to foreign migrant workers in Thailand, where hundreds of thousands of Cambodians live and work.

The activities of the group were exposed on Friday by Thai television outlet Channel 3, after Burmese migrants complained their names and personal details had been duplicated on ID cards carried by other workers in the province of Pathum Thani.

At least 300 fake ID cards have been discovered, with Pathum Thani Permanent Provincial Secretary Chalermpol Mangkang telling Thai media the investigation is ongoing.

“We expect to find many more,” Khaosod reported him saying.

Four of the officials involved remain under investigation, while the fifth has been moved to an “inactive post”, the news website reported.

Officially called a TR 38/1, the ID cards in question allow foreign migrants to work in the country for a limited time.

It is unclear how many Cambodians were affected.

Thailand-based migrants’ rights activist Andy Hall, said the revelation was unsurprising as registration was “extremely corrupt”.