WASHINGTON - The Central Intelligence Agency destroyed 92 videotapes documenting the harsh interrogations of two Al Qaeda suspects in C.I.A. detention, a greater number of destroyed tapes than the government had previously acknowledged. The revelation came in a letter filed Monday by federal prosecutors who are investigating the destruction of the tapes by the agency's officers, which occurred in November 2005, according to The New York Times. The agency is known to have previously destroyed hundreds of hours of videotaped interrogations, but the documents filed Monday reveal the number of tapes for the first time. The tapes had been held inside a safe in the C.I.A. station in Thailand, the country where two Al Qaeda suspects - Abu Zubaydah and Abd al-Rahim al-Nashiri - were interrogated. The filing of the documents on Monday, submitted to a court in New York as part of a Freedom of Information Act lawsuit brought by the American Civil Liberties Union, comes as federal prosecutors are wrapping up the investigation into the matter. The criminal investigation, begun in January 2008, is being led by John Durham, a career prosecutor from Connecticut with long experience trying organized-crime cases. The order to destroy the tapes was given by Jose Rodriguez, who at the time was the head of the spy agency's clandestine service. Prosecutors have spent months trying to piece together whether anyone besides Rodriguez may have authorized the destruction of the tapes, and to decide whether anyone should be indicted in the matter. The tapes were destroyed at a time when Congress and the courts were intensifying their scrutiny of the agency's detention and interrogation programme. The civil-liberties union is asking a judge to hold the agency in contempt for destroying the tapes, the Times said. A Justice Department spokesman declined to comment on the matter on Monday. According to the letter that was filed, the agency has asked to have until Friday to produce a schedule for the court detailing when it will turn over a number of records associated with the destruction of the tapes, including a list of witnesses who may have viewed the videotapes beforehand.