The Metropolian Police Commissioner has said Scotland Yard must deal better with black suspects.
Speaking on LBC Radio, Bernard Hogan Howe pledged to deal with all allegations of abuse. He also said he wanted at least one in three police officers in London to be from an ethnic minority.
Ten cases of alleged racism are currently being investigated by the police watchdog.
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In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.
The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.