Times: A leaked four-page report by the Joint Intelligence Committee (JIC), which oversees all spying, is the first definitive evidence that the intelligence services expected terrorists to strike at the Underground.
It stated: "The UK and its interests remain high in Al-Qaeda's priorities . . . Plans have been considered to attack Heathrow, the London Underground and other targets."
See government references to prior knowledge in the reports analysis
Times: The new evidence shows MI5 monitored Khan when he met suspects allegedly planning another, separate attack; that he had knowledge of the "late-stage discussions" of this plot; and that he was recorded having discussions with them about making a bomb and leaving the country. He was also recorded talking about his plans to wage jihad - holy war - and go to Al-Qaeda terrorist camps abroad.
If this is true then serious questions need to be asked to find out why MI5 did not perceive Khan as a threat and continue the surveillance. Why have MI5 seemingly withheld crucial information from the government and the public?
AP: Just before the blasts, Scotland Yard called the security officer at the Israeli Embassy to say they had received warnings of possible attacks, the official said. (Police later denied any warning was given)
One under-reported story surrounding 7/7 seriously suggests that people made money through selling the pound short in the days prior to the bombings. see here
It was noted early on that Khan had been under surveillance by MI5 due to an investigation in 2004. In December Charles Clarke stated that secret intelligence on the bombers may be released. Days later it became relatively clear that MI5 were now admitting to having Tanweer and Khan under surveillance pre 7/7. This is perhaps what the French were referring to from the beginning. see below
Unconfirmed security sources have spoken of all four bombers being tracked by field agents prior to 7/7. Unconfirmed sources have also stated that Khan had been involved in terrorism as far back as 2001.
Israeli prior knowledge
Arutz Sheva: Report: Israel Was Warned Ahead of First Blast
Belfast Telegraph: French say suspects were arrested then freed
Independent: Reconstruction: 77 What really happened?
Observer: UK was warned of July suicide attacks
World Net Daily: Who shorted British pound?
US Prior Knowledge
NY Daily News: NYPD tied to Brit-blasts tip
British Prior Knowledge
Telegraph: MI5 'blunders let Tube bomber slip away'
Guardian: Bombers 'tracked before July 7'
Independent: Revealed: MI5 ruled London bombers were not a threat
Times: Spies warned of Tube attack
Global Research: Why did it take so long to bring Abu Hamza to trial?
Guardian: Families set to sue over 7/7 errors