An inquiry into the death of Brazilian Jean Charles de Menezes,
shot by London police who mistook him for a suicide bomber, has reached its conclusion.
The Independent Police Complaints Commission is due to hand its report
to the Crown Prosecution Service for it to decide if anyone should be charged.
Ministers will also receive the report, but it will not yet be made public.
Mr Menezes, 27, was killed at Stockwell Tube station, in south London, the day after the failed 21 July bombings.
Police and soldiers were watching the block of flats where Mr Menezes lived,
believing a man suspected of the 21 July attacks lived there.
A soldier saw the electrician leave his flat and thought he resembled the suspect.
He suggested it was "worth somebody else having a look".
Evenly spaced shots
The IPCC investigation has focused on how this vague identification led to Mr Menezes being shot dead on the Tube.
The BBC has obtained an eyewitness statement, given to the IPCC,
which described how anti-terror officers shot at Mr Menezes 11 times.
The statement read:
"The shots were evenly spaced, with about three seconds between the shots for the first few shots.
"Then a gap of a little longer. Then the shots were evenly spaced again."
Mr Menezes, from Gonzaga in south-eastern Brazil,
was hit seven times in the head.
Commander Cressida Dick was in charge of armed officers,
and her colleague Commander John McDowell was in charge of surveillance officers on the day of the shooting.
But it is not clear who will bear the brunt of any IPCC criticisms, BBC home affairs correspondent Daniel Sandford said.
Mr Menezes' family want charges brought against senior officers and those who pulled the trigger.
Alex Pereira, a cousin of Mr Menezes, said: "Those who came with guns all had an intention to kill. There's no way to forgive them."
But former firearms officers have warned charges could lead to protests, with armed officers refusing to carry guns.
Roger Gray, a former firearms officer, warned of a potential "crisis".
"If they start to, as they say, hand in their ticket, because they are all volunteers, and it goes beyond a certain number, then the ripple effect will go right through London and I think it will probably go through the country," he said.
Commissioner's conduct
IPCC chairman Nick Hardwick said last month the commission was confident
it knew what happened at Stockwell Tube station and why.
Documents related to the IPCC probe, leaked last August, seemed to contradict eyewitness reports and initial police quotes that Mr Menezes' "clothing and demeanour" added to suspicions he was a suicide bomber.
The inquiry has interviewed a number of Metropolitan police officers of all ranks over Mr Menezes' death, but the head of the force, commissioner Sir Ian Blair, was not among them.
A separate IPCC investigation is being held into Sir Ian's handling of the affair.
All 30 passengers in the train carriage at the time of the shooting have been interviewed,
and the probe took a total of 600 written statements.