"He immediately stood up and advanced toward me and the CO19 [special security] officers ... I grabbed the male in the denim jacket by wrapping both my arms around his torso, pinning his arms to his side.
"I then pushed him back on to the seat where he had been previously sitting ... I then heard a gun shot very close to my left ear and was dragged away onto the floor of the carriage."
Harriet Wistrich, a lawyer for the Menezes family, was shocked by the new details, but said they further vindicated the young electrician.
"There's obviously some level of incompetence here or some serious breakdown in communications with the various officers involved in surveillance," Wistrich told Channel Four News.
The police were on a high state of alert because of the July 7 and July 21 bombings, and had been briefed that they may be called upon to carry out new tactics -- shooting dead suspected suicide bombers in order to avoid another atrocity.
The IPCC investigation report states that the firearms unit had been told that "unusual tactics" might be required and if they "were deployed to intercept a subject and there was an opportunity to challenge, but if the subject was non-compliant, a critical shot may be taken."
But the report shows that there was a failure in the surveillance operation and officers wrongly believed Menezes could have been one of two suspects -- including Hussein Osman, who they thought was in the building.
The leaked papers state: "Menezes was observed walking to a bus stop and then boarded a bus, traveling to Stockwell tube station.
"During the course of this, his description and demeanor was assessed and it was believed he matched the identity of one of the suspected wanted for terrorist offences ... the information was passed through the operations center and gold command made the decision and gave appropriate instructions that de Menezes was to be prevented from entering the tube system.
"At this stage the operation moved to code red tactic, responsibility was handed over to CO19."
A senior police source on Tuesday told the Guardian the leaked documents and statements gave an accurate picture of what was known about the shooting, and the mistakes that led up to it.
Neither Scotland Yard, the Home Office or the IPCC would comment.
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