CIA Director John Brennan defended harsh interrogation techniques, saying they provided information - some of which was "useful" in the raid that led to the death of Osama bin Laden, but he said it was "unknowable" what information could specifically be attributed to those techniques.

"It is our considered view that the detainees who were subjected to enhanced interrogation techniques provided information that was useful and was used in the ultimate operation

to go against Bin Laden,' Brennan said.

Brennan's comments, in a rare news conference, come two days after a Senate panel released a blockbuster 528-page report detailing 'enhanced interrogation techniques' - including

mock executions, "rectal rehydration,' sleep deprivation and beatings - in interrogations in the mid-2000s.

He admitted that some CIA officers' actions were "not authorized, were abhorrent and rightly should be repudiated by all. And we fell short in holding some officers accountable for their mistakes."

Brennan acknowledged that the agency sometimes exceeded its legal authority during interrogations of terrorism suspects.

He said detainees who faced "enhanced interrogation techniques" did provide some information that provided useful - as well as other information that didn't.

But he staunchly defended the agency during the 45-minute news conference, adding: 'CIA officers' actions that did comport with the law and policy should neither be criticized nor conflated with the actions of the few who did not follow the guidance issued."

Brennan opened his remarks with a vivid depiction of the events of the Sept 11, 2001 terrorist attacks, and described the atmosphere going into fighting terrorism and collecting intelligence in the immediate aftermath of the attacks.

"There were no easy answers, and whatever your views are on (enhanced interrogation techniques!, our nation and in particular this agency did a lot of things right during this difficult time to keep this country strong and secured,’ Brennan said at a rare press conference at the CIA headquarters in Langley, Virginia.

Brennan praised those who worked

with him but he added the agency was 'unprepared to conduct a detention and interrogation program, and our officers inadequately developed and monitored its initial activities."

His strongest criticism of the report was with its contention that the CIA misled the public and government officials - including then-President George W. Bush. That, Brennan said, is untrue - a stance former Vice President Dick Cheney backed up in an interview with Fox News on Wednesday night.

Brennan was the CIA's deputy exec-

utive director while the tactics were being used. He said he had 'some visibility" into what was happening, but that he wasn't in the chain of command for that program, and didn't say whether he had made any effort to push for changes at the time.

He also noted that the program for using "enhanced interrogation techniques" was ended in 2007.

Meanwhile, Cheney yesterday said president George W Bush was "fully informed* about CIA interrogation techniques. Dick Cheney said Bush 'knew everything he needed to know' about the programme, and the report was 'fullofcrap".