The police watchdog said it is following "a number of significant lines of inquiry" surrounding the death of Mark Duggan.
Rachel Cerfontyne, deputy chairwoman of the Independent Police Complaints Commission, said the body is trying to speak to key witnesses who have either so far refused to be interviewed or who have given conflicting accounts.
The watchdog is also looking at the way police dealt with intelligence connected to the 29-year-old before he was gunned down, in the wake of criticism by the jury at the inquest into Mr Duggan's death. Mr Duggan was shot by a Scotland Yard marksman after armed officers stopped the taxi in which he was travelling in Tottenham, north London in August 2011.
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