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U.N. High Commissioner for Human Rights Louise Arbour said on Tuesday planned Guantanamo war crimes trials fell short of international standards and handing down death penalties would be "just not acceptable".

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Arbour has long denounced the system created by the Bush administration to try suspected al Qaeda operatives outside regular civilian and military courts, and alleged torture and secret renditions conducted in the U.S.-led "war on terrorism".

"In a process where the definition of a crime is somewhat more ambiguous, the standard of proof is lowered, the capacity to make a full answer of defence is lowered, the chances of wrongful conviction necessarily increases," Arbour said

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