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THE HAGUE, Netherlands — The chief prosecutor of the U.N. Yugoslav war crimes tribunal has voiced concern at the "destructive" effects of a critical letter written by one the court's judges that suggested the United States may have tried to influence verdicts.

Washington has emphatically rejected the suggestions in a letter written by Danish Judge Frederik Harhoff and leaked to the media in the aftermath of three high-profile acquittals of senior suspects.

Harhoff's letter offered no evidence to back up his suspicions of interference, but it enraged survivors of the Balkan wars.

Chief Prosecutor Serge Brammertz said Monday he is "concerned about destructive elements in the debate" that followed the letter's publication.

Brammertz says he will appeal the most recent acquittal and is considering seeking a review of another of the cases.