Cambodian rights groups and the country’s banned opposition Cambodia National Rescue Party called on Monday for an investigation into the death in police custody of the son of a CNRP activist, with the CNRP calling the death a “new form of political murder.”

Tith Rorn, 37 and the son of CNRP member Eam Tith, died on April 18 in Kampong Cham province in what police described as a fall in a jail restroom, though his body bore multiple bruises, raising fears he had been killed by jail guards.

Cambodian authorities are now trying to evade accountability for the death, the CNRP said, rejecting official explanations of how the young man died and calling on human rights groups and the international community to seek justice for his family.

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