The U.N. investigator on torture said on Tuesday the United States had denied his request to visit U.S.-run jails in Iraq and insisted a visit could help clear its legacy of the prison abuse scandal in Abu Ghraib.

Manfred Nowak, United Nations special rapporteur on torture, said he had received credible information the situation had improved at U.S. detention facilities in recent years, but stressed only a visit would allow him to verify them.

An international outcry erupted in 2004 after images of prisoner abuse by U.S. military personnel at Abu Ghraib west of Baghdad, including naked detainees stacked in a pyramid and others cowering before snarling dogs, became public.

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"I was a little astonished that the U.S. government is not willing to grant me access because it might perhaps even be in their own interest if I compared different detention facilities," Nowak told a news briefing in Geneva.

"It might also be in their interest in overcoming the legacy of having been criticized so much for torture practices in Abu Ghraib and other detention facilities up to 2004," he added.

Nowak, who has an Iraqi government invitation for his Oct 18-26 planned visit, said he would also expect full access to Iraqi-run detention facilities, although this was still under negotiation. British authorities have agreed to allow him to visit their detainees in Iraq, he added.

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