Ambassador Dan Mozena said that a human rights organisation like it has "a critical role to play."
The prosecutors sought permission yesterday from a special tribunal to file a contempt notice against the New York-based rights organisation because of a statement in which HRW said the trial of former Jamaat-e-Islami party chief Ghulam Azam was "deeply flawed" and did not meet international standards.
The statement the group issued Friday alleged the "judges had improperly conducted an investigation on behalf of the prosecution" and mentioned "collusion and bias among prosecutors and judges."
Both the defense and prosecution have appealed the verdict. The maximum punishment Azam could have faced was the death penalty.
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The prosecutors' petition accuses HRW's board of directors, its director for the Asia region, Brad Adams, and his associate Storm Tiv Adams and the group's representative in India did not immediately answer messages seeking comment today.
The prosecution's filing said HRW raised "biased, baseless, utterly false, fabricated and ill-motivated" allegations involving the trial process. It also called the statement most unethical as the appeals from both sides are pending with the Supreme Court.
Prime Minister Sheikh Hasina's government is holding war crimes trials over the independence war under protest from the main opposition Bangladesh Nationalist Party and its key ally Jamaat-e-Islami party.
Jamaat-e-Islami is accused of organising forces against the fighters who sought independence.