Montagnards, many of whom are Protestants, have long claimed persecution in Vietnam for religious reasons and for their aid of US troops during Vietnam war.
The Cambodian government has a history of deporting minorities from Vietnam who flee across the border seeking refuge.
Small number of Montagnards have been in hiding in forests of Ratanakiri province since late October, claiming oppression in Vietnam.
In a hand-written letter from Prey Sar prison, the activists say they were improperly tried by Phnom Penh Municipal Court.
A group of non-governmental organization leaders and researchers say the key to ending impunity in Cambodia is people’s full participation in politics and society.
Meach Sovannara, a former Radio Free Asia reporter, is facing a hefty sentence on charges of insurrection, for allegedly orchestrating violence in a July 15 protest.
At least three monks have been arrested and charged with disturbing public order.
Ten activists, three monks and two opposition members are currently in detention on various charges.
Lawyers for seven imprisoned activists on Thursday appealed for their release, following a swift trial and sentencing earlier this week that has been widely criticized.
The three activists Wednesday, including a former monk, were charged with disturbing public order, the same charge brought against the seven activists the day before.
The activists were sentenced to a year in prison and fined $500 each.
A former Japanese reporter is doing her part in the fight against human trafficking in Cambodia by publishing comic books and distributing them for free in and around Cambodia.