The family of Jean Charles de Menezes was today shown "distressing" CCTV footage of the Brazilian's last moments alive before he was shot dead by police at Stockwell Tube station.

The electrician looked "relaxed and normal" on the Underground platform, the family said, before armed officers fired at least seven bullets into his head and shoulders at point blank range.

"It was very distressing to see how completely relaxed and normal Jean Charles appeared, particularly in the light of statements made immediately after his death," they said, after meeting Nick Hardwick, who is heading the independent inquiry into their son’s killing.

Initial reports from police and witnesses on the day of the shooting said that Mr de Menezes had been wearing a bulky jacket, had vaulted a ticket barrier and run when challenged by officers. But leaked details of evidence submitted to the independent inquiry suggested all those details were incorrect.

It was confirmed today that six officers involved in the fatal shooting are facing the prospect of criminal charges

Mr de Menezes’s mother, Maria, his father, Matozinhos Da Silva, his brother Giovani and cousin Alex Pereira are on the third day of an emotionally-charged trip to London that has been funded by the Metropolitan Police.

A family representative said that they had agreed that they would not disclose confidential information which forms the basis of the inquiry into the shooting of the Brazilian, who was mistaken for a suicide bomber on July 22 in the wake of the London bombings.

A spokesman for the Independent Police Complaints Commission said: "We will give the family as long as they need and as much information as we can about the investigation."

Maria de Menezes added: "Jean Charles loved London, it was his home. We do not want any more innocent people in London to be killed or any more families to suffer as we do. We hope lessons will be learnt."

Sir Ian Blair, the Metropolitan Police Commissioner, today opened up a public debate on the controversial shoot-to-kill policy.

Mrs de Menezes yesterday demanded that Sir Ian resign, saying that he should bear responsibility alongside those who gunned down her son "like a mad dog". Sir Ian indicated last week that he might step down if he is heavily criticised when the IPCC publishes the findings of its inquiry later this year.

Sir Ian told the monthly meeting of the Metropolitan Police Authority: "Until this point the police service has developed its policy with ministers and Home Office officials. We now move to another position in which we have to demonstrate democratic accountability."

He said that he was not sure what form the debate could take because specific details about Operation Kratos - the strategy introduced after September 11 which governs the use of lethal force against suspects - could not be made public without threatening its effectiveness.

But following widespread concern about the policy - which he has attempted to re-label "shoot-to-kill-to-protect" - has insisted that there was a need for a broader consensus.

In an announcement which underlined the requirement for a sound legal basis to protect both the public and the police, Scotland Yard today confirmed that officers involved in the shooting of Mr de Menezes could face criminal prosecution.

Two marksmen who fired seven bullets into Mr Menezes at close range are believed to have been served with Regulation Nine notices listing allegations against them - the first stage in any disciplinary process that could lead to a trial at the Old Bailey.

Four surveillance officers who trailed him from his flat in Tulse Hill, South London, to the Tube station, wrongly identifying him as one of the four would-be suicide bombers on the run after a failed attempt to repeat the July 7 bombings, also face possible legal action.

"Any action taken by a police officer can result in criminal charges," a spokesman said. "They have been made aware of that."

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