Forty-eight hours later Stephen Carroll, a police constable with less than two years to go until retirement, was shot in the head when he answered a call for help in Craigavon.

48小时后，还有不到两年就退休的警员斯蒂芬·卡罗尔，在接听克雷加文区的来电时被射中头部。

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Acpo's head of crime, Merseyside Chief Constable Jon Murphy, said undercover officers played a critical role gathering evidence and intelligence to protect communities from harm.

BBC: Undercover policing: MPs demand reforms

Assistant Chief Constable Malcolm Graham, head of major crime and public protection, said the new approach aimed to identify victims of human trafficking rather than criminalising them.

BBC: Human trafficking victims

Mr Crompton emailed the force's Assistant Chief Constable Andy Holt and head of media Mark Thompson on 8 September, four days before the Hillsborough Independent Panel Report was released.

BBC: Police chief email accuses Hillsborough group of lying