Thirty-eight people remain in unlawful detention after they were seized by authorities as they protested outside City Hall this week.
The demonstrators were seized Wednesday, where they had demanded the courts release eight representatives arrested earlier this month.
Around 300 families lost their homes in the Jan. 3 forced eviction of Borei Keila.
An estimated 20,000 Cambodians are trafficked throughout the region each year.
The site, at Phnom Bath mountain, is 50 kilometers outside the capital and lacks clean water, electricity, and health care facilities.
Moek Dara is accused of abusing his post to gather hundreds of thousands of dollars in bribes and organizing drug trafficking.
Thailand forcibly returned more than 100,000 Cambodians last year.
In a meeting this week both foreign ministers said they would speed up negotiations over joint development in offshore blocs.
Recently, Prime Minister Hun Sen has called for the nullification of land certificates in protected natural areas in Cambodia.
Growth was bolstered by strong garment exports, increased tourism and a slowly recovering real estate sector, IMF said in a statement.
In recent testimony, Nuon Chea accused the Vietnamese of their own atrocity crimes, a claim Vietnamese officials deny.
Independent analyst Lao Monghay said he supports reform plans, but they are not being implemented.