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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The attack took place about 6 a.m. in the city of Dera Ismail Khan, according to Ghulam Rabbani, head constable.

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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.

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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.

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