More than 400 personnel will take part in training exercises that begin Wednesday in Kampong Speu province and run through May 27.
International prosecutor Andrew Cayley expected to see no more than 10 people on trial.
Reach Sambath fell in his office on Tuesday, suffering an apparent stroke from high blood pressure.
The BBC World Service Trust surveys 2,401 Cambodians from all walks of life.
About 60 million people depend on the Mekong directly or indirectly for their livelihoods.
About half the respondents—52 percent—said low salaries were causing a decline in education quality.
Survivors were invited to draw what they could remember of the Khmer Rouge, from torture to lost family members.
The proposed March comes as workers face increasing pressure from food and fuel prices, while salaries remain low.
For two days, from April 29, researchers, experts and enthusiasts will gather in Athens, Ohio, to share their thoughts and findings.
“In order for a country to be both economically and politically strong and powerful, youths' human resources are needed", said a caller.
Ouk Seng said Thursday she had made up the allegations because she wanted to return home to her children.
At least 11 demonstrators were arrested and four were injured in police beatings.
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