July 7 security report expected
The security services are expected to be cleared of missing chances to prevent the July 7 London bomb attacks by a Government report.
A probe by the Intelligence and Security Committee (ISC) on the information available in the run-up to the 2005 blasts will be published by the Prime Minister.
In a previous report in 2006, the ISC revealed that bombers Shehzad Tanweer and Mohammed Sidique Khan were known to the security services but were not investigated.
However, it said said it was "understandable" that a full probe was not launched.
Questions were raised after new information came out in subsequent terror trials.
Victims have called for a full public inquiry in to what was known before the attacks took place.
Tory MP David Davis called for an "excruciatingly detailed" public examination of all the evidence.
On Monday Chris Driver-Williams, a former senior analyst for the Defence Intelligence Staff said there was an "information vortex" in the immediate aftermath of the attacks, which killed 52 people and injured hundreds more.
He also revealed that his claim of an al Qaida link with the attackers was initially met with laughter. One senior intelligence officer attending the Cobra meeting said the idea of an al Qaida link was "absurd".
Mr Driver-Williams said: "When I suggested this at Cobra, I was met with laughter. This was by people in the intelligence community who knew their onions."
