Phnom Penh authorities will build a memorial on Diamond Island for the dead.
Officials say at least 378 people were killed during a crowd stampede on a bridge near Diamond Island, following the Water Festival.
Last Friday, the city honored 19 different immigrant nations with a flag ceremony and the naturalization of 20 people.
As many as 200,000 people were forced into marriage under the Khmer Rouge, which sought a communist agrarian utopia.
The accident took place at a newly-built bridge to Koh Pich, a new development area that has recently been open to public.
Two toddlers, aged three and four, were saved from drowning, authorities confirmed early Tuesday.
Authorities reported that 345 were killed and 410 others were wounded in stampede.
The festival of boat races will last through Monday, when the moon is full, the largest collective revelry in the Cambodian calendar.
Duch was arrested in May 1999 and was later charged by the tribunal for war crimes, crimes against humanity, torture and homicide.
"Hello VOA" callers also expressed concern over torture in Cambodia, as well as land grabs and violence against human rights workers.
As many as 200,000 people were forced into marriage during the Khmer Rouge rule between 1975 and 1979, according to research.
The rights group Licadho counted 118 instances of torture in detention in 2009 and another 101 cases in 2010.
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