This isn’t the first time London has been hit by a wave of gun crime, writes Patrick Sawer. A father of six is shot dead in cold blood as he tries to foil an armed raid on a jeweller's in London's Soho. Despite attempts by other witnesses to stop the three armed robbers, they melt into the crowd. The murder, carried out in broad daylight, sparks one of the biggest murder hunts in the history of the Metropolitan Police and prompts a wave of fear across the capital over increasing gang violence and gun crime.

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