The Independent Police Complaints Commission (IPCC) has concluded the shooting of a man arrested during an anti-terror raid in east London was an "accident".
In her report on the incident, IPCC Commissioner Deborah Glass said the firearms officer who shot Mohammed Abdulkahar, 23, had committed no criminal or disciplinary offence.
Here are some of her key findings:
Ms Glass said: "I am satisfied there is no evidence of intent or recklessness on the part of the firearms officer and that no offence was committed in the firing of the weapon.
"There is no evidence to support the speculative reporting that the weapon was fired by one of the brothers, or that it was a deliberate act by the police officer."
Safety catch off
Her report said a forensic scientist had found no fingerprints on the trigger of the weapon but had concluded that the only way for it to have been fired was for the trigger to have been pulled.
The document said the forensic examination found evidence consistent with the police officer's description of events and which showed the pair were closer together than the 3ft distance described by Mr Abdulkahar when the shot was fired.
The gun, a Heckler and Koch MP5 carbine, had its safety catch off for a "high-risk entry" the report said.
The officer, named only as B6, told investigators he was on a half-landing in the house when he saw "two figures approaching".
B6 told the IPCC he was aware of a person or persons pulling at his right arm and thought they were trying to take his gun.
Mr Abdulkahar told investigators he thought the raid was a robbery as he did not realise the men were police officers.
"He believed that when he was less than 3ft from the men there was a bang and an orange flash," the report said.
"He says he felt a pressure but did not realise he had been shot."
Ms Glass did not blame Mr Abdulkahar for putting forward a version of events not backed by forensics.
She said in her report: "From the equipment and respirators worn by the officers it is not surprising that he did not recognise them in the dark to be police officers."
B6 told investigators he shouted "armed police" as he climbed the stairs.
Ms Glass said: "As he was wearing a respirator any words spoken would have been muffled."
The commissioner said the investigation would not be referred to the Crown Prosecution Service (CPS) for consideration on criminal charges.
Mr Abdulkahar's injury was serious enough to be judged grievous bodily harm but there was no evidence of intent, she added.
Neither was there scope for prosecution under health and safety laws.