Arrested in 2017 in a midnight swoop, Kem Sokha was accused of planning to topple the government of longtime ruler Hun Sen.
Concerns have arisen recently about H5N1 infections in a variety of mammals and the possibility that the virus could evolve to spread more easily to humans.
Health authorities and scientists say new formulas are needed to break the super-resistance of mosquitoes in Asia.
Around 400 individuals, including foreign nationals, were believed to be working at the Grand Diamond City casino-hotel in Poipet at the time of the blaze.
According to the World Wildlife Fund "the recent increase in illegal fishing activities in the dolphin conservation areas" would destroy the Mekong River dolphin population in Cambodia.
US President Joe Biden held talks with allies Japan and South Korea as fears mount North Korea would soon conduct its seventh nuclear test amid a record-breaking recent spate of missile tests.
US President Joe Biden, who is on a whirlwind trip with stops at the COP27 climate summit in Egypt, ASEAN in Phnom Penh and the G20 summit in Indonesia, referred to Cambodia as Colombia.
Several representatives of the Association of Southeast Asian Nations blame Myanmar's military rulers for failing to implement a peace plan agreed upon jointly last year.
Police questions boat owners and the operator after 11 children died when the overloaded boat sank.
The victims were aged between 12 and 15, while two adult boat operators and two students were rescued.
The bodies of two more people were found after a boat carrying Chinese nationals capsised, while eight remain missing.
Search operations are ongoing to find the remainder of the 41 Chinese nationals who were aboard the vessel, while two Cambodian sailors involved in the incident have been arrested.
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