A military police spokesman told local media that officers shot at Wutty, and that one military police officer was killed in the exchang
The men were charged under the new penal code and will face an investigation.
Saloth Ban has been on the stand all week at the UN-backed court describing inner workings of the regime.
Sam Rainsy has been in exile since October 2009.
His testimony corroborates that of convicted torture chief Duch, as prosecutors seek to tie Ieng Sary and two more leaders.
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Police said the assault occurred when one of the purported victims and a security guard attempted to retrieve a necklace from the room.
The World Bank is holding an annual meeting and the ABD is currently reviewing its policies on projects.
Keat Chhon is among six senior government officials who have refused to appear before the tribunal.
The World Bank subsequently froze its funding to Cambodia, pending more results in curbing land grabs.
The courier, Sot Troeung, linked Nuon Chea to the torture center Tuol Sleng in testimony Thursday.
Sot Troeung, who is 62, told the court he carried letters from Nuon Chea to the head of Tuol Sleng prison, Duch.