A report into police actions following the shooting of Jean Charles de Menezes has been altered because of threatened legal action, the police watchdog says.
Jean Charles de Menezes was shot seven times
The Independent Police Complaints Commission (IPCC) said "minor changes" had been made after a legal challenge by officers criticised in the report.
They applied for a judicial review claiming the IPCC breached procedural rules, the Guardian newspaper reported.
Mr Menezes was shot by police at Stockwell Tube station on 22 July 2005.
The Guardian claims the report's findings, to be published on Thursday, will criticise senior Metropolitan Police officers.
They include Britain's most senior counter-terrorist officer, Andy Hayman, who will be accused of being deliberately misleading, the newspaper says.
It is not known whether the head of the Metropolitan Police, Sir Ian Blair, will be criticised.
Mr Menezes, 27, from Brazil, was shot eight times by anti-terrorist police after being mistaken for a suicide bomber in the aftermath of the 7 July London bombings and the failed 21 July 2005 attacks on the Underground.
His cousins and supporters are campaigning for someone to be held accountable for the shooting.
Following the IPCC's Stockwell One report into the circumstances surrounding the shooting, the Crown Prosecution Service decided last year that no individual should be prosecuted in connection with the case.
However, the Metropolitan Police is facing trial under health and safety legislation in October.
The IPCC's second report, Stockwell Two, relates to complaints of inaccurate information given to the public by Scotland Yard after the incident.
The two-year investigation looked into claims that senior police officers were aware an innocent man had been killed earlier than was announced, and whether they failed to correct wrong information suggesting Mr Menezes acted suspiciously before his death.
A spokesman for Justice4Jean, which is campaigning to find out what happened on the day of the shooting and its aftermath, said he hoped the report would answer key questions.
"We hope the IPCC deliver a thorough investigation into the lies and misinformation put in the public domain by the police following Jean's killing and that those responsible are held accountable for their actions," he said.