Londoners like to think of their city as a mixed, multicultural sort of place. But when it comes to the policing of murder, it is as segregated as a southern American backwater. If a white man shoots and kills a black man, the crime is investigated by one team of officers. If a black man shoots at a white man but merely injures him, this will be investigated by another team. And if a black man shoots another black man, a third team swings into action.
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