British officials investigating the death of Jean Charles de Menezes are investigating new claims over when officers at the Met knew that an innocent man had been shot dead.
Met Police chief Sir Ian Blair has said in the past that he did not know until the day after that the victim was a Brazilian electrician who had been mistaken for a terrorist.
But the BBC said it had learned that claims were being investigated that someone in Sir Ian's private office believed the wrong person had been killed just six hours after the shooting at Stockwell Underground station in July last year.
The BBC said the new claims had come from a "senior officer" who had told independent investigators looking at the de Menezes case.
However, it added that the claims were being "emphatically" denied and that the investigators from the IPCC were now attempting to get to the bottom of the allegations.
A spokesman for Scotland Yard said the force could not comment on the reports.