The US has been widely criticised by European allies and human right groups for methods like "waterboarding", in which prisoners are made to fear that they are drowning.
George Bush, the US president, has repeatedly said that the US does not torture prisoners.
The White House said on Friday that the president had no recollection of being told about the 2002 tapes, or their subsequent destruction in 2005, following the Abu Ghraib prisoner abuse scandal in Iraq.
Michael Hayden, director of the Central Intelligence Agency (CIA), said on Thusrday that the tapes were destroyed so that the identities of interrogators would not be compromised.
On Friday, leading Democrats called for inquiries into the matter by the justice department and congress and criticised the CIA for acting above the law.
Edward Kennedy, the Democratic senator for Massachusetts, spoke of a cover-up reminiscent of the Watergate scandal that drove Richard Nixon from the presidency in 1974.
In a speech on the senate floor, Kennedy said: "The past six years, the Bush administration has run roughshod over our ideals and the rule of law. Now, when the new Democratic Congress is demanding answers, the administration is feverishly covering up its tracks."
However, George Little, a CIA spokesman, said leaders of relevant congressional committees were told of the tapes, the CIA's plans to destroy them and that they had been destroyed.
The CIA's director said earlier that the agency's internal watchdog had watched the tapes in 2003 and verified that the interrogation practices recorded were legal.
Bush has been a strong defender of the CIA interrogation programme, saying it has produced intelligence that has helped capture al-Qaeda members and prevent attacks.
The program is critical to the safety of the country," Dana Perino, the White House spokeswoman, said on Friday.
Perino said Bush did not recall being told about the interrogation tapes or their destruction before he was briefed by Hayden on Thursday.
She said: "He has no recollection of being made aware of the tapes or their destruction before yesterday."
The destruction of the tapes comes amid scrutiny of the CIA's "rendition" programme, where suspects were allegedly detained and interrogated in secret locations outside the US.
On Friday, Amnesty International, the UK human rights organisation, called for the destruction of the tapes to be part of that inquiry.
The group said in a press release that "the destruction of the tapes falls into a pattern of measures taken by the government that block accountability for human rights violations".
Speaking to Al Jazeera, Mark Agrast, of the Centre for American Progress, said: "The timing is very disturbing because they [the tapes] appear to have been destroyed at precisely the time that the Abu Ghraib photographs had come out and the stories of highly coercive interrogation practices were becoming known."
During the Abu Ghraib scandal in 2004, leaked pictures of US forces abusing Iraqi prisoners caused an international outcry.
Members of the US 9/11 commission and congress have expressed surprise that the tapes existed, saying that the CIA repeatedly claimed it did not record the interrogation of detainees.
Agrast told Al Jazeera: "There will be congressional investigations, because this story was not shared with the house and senate intelligence committees that by law are supposed to be informed of activities of this kind."
Hayden's revelation appeared to be an attempt to pre-empt the New York Times, which informed the CIA on Wednesday evening that it planned to publish a story about the destruction of the tapes.
Hayden said he was informing staff because the press had learnt about the destruction of the tapes.
Source: Al Jazeera and agencies
Güncelleme Tarihi: 08 Aralık 2007, 15:07