British spies will be cleared in a number of cases of alleged complicity in the torture of detainees abroad, the BBC understands.
Scotland Yard and the Director of Public Prosecutions (DPP) are to issue a joint statement on Thursday.
It follows an investigation into the conduct of officers from MI5 and MI6.
Although it is expected that no charges will be brought in some cases it is understood the statement will contain other significant information.
The BBC's home affairs correspondent, Danny Shaw says the fact that the statement has been prepared by the DPP, together with Scotland Yard, is highly significant.
He says it raises the prospect that police investigations are not yet over.
The investigation, which began in March 2009, was sparked by allegations that MI5 was complicit in the torture of a former Guantanamo Bay detainee, Binyam Mohamed.
It was alleged an MI5 officer - known as Witness B - was aware of and colluded in Mr Mohamed's mistreatment while he was held in Pakistan.
The DPP, Kier Starmer, eventually concluded there was insufficient evidence to charge Witness B.
But he decided that a "wider" investigation would continue into "other potential criminal conduct".
An inquiry has also examined allegations against an officer from MI6.
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