In a statement on Tuesday, the Extraordinary Chambers in the Courts of Cambodia (ECCC) said the decision marked the conclusion of more than eight years of investigative work.
The Southland factory suspended 10 members of the Collective Union of Movement of Workers (CUMW) after they protested the decision, according to an industry association.
Election observers have opted to wait until the official results are announced before commenting on the quality of the election process.
The building became an iconic Phnom Penh landmark after it was designed by Van Molyvann in the 1960s as low-cost, attractive social housing.
Observers say about 800,000 workers had been unable to travel, the majority of whom were migrants.
Two reporters of the Cambodia Daily were reporting from Ratanakkiri province’s O’Yadav district last month when the alleged violations are claimed to have taken place.
The government dismissed Amnesty’s findings, saying it was an attempt to influence the forthcoming local elections, which will take place on Sunday.
Sebastian Strangio recently wrote an article titled “Welcome to the Post-Human Rights World”.
A small number of the roughly 1 million Cambodian workers in Thailand who have managed to register to vote will be unable to cast a ballot if no assistance is forthcoming, they told the Hello VOA program on Thursday.
The case is due to be heard on June 8.
The peacekeepers who died during an ambush in the central African nation earlier this month were: Im Sam, Sieng Norin, Mom Tola and Mao Eng.