Darren Rathband, the twin brother of blinded Pc David Rathband, paid an emotional tribute to him at a cathedral service in Newcastle.
Among the mourners at St Nicholas' Cathedral, Newcastle, were Policing Minister Nick Herbert, actor Tim Healy and Northumbria Police chief constable Sue Sim.
The officer's children Mia, 13, and Ashley, 19, were seated at the front of the historic church.
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It is claimed that both police and security services, including MI5, have been prevented from vast pools of data on the social media site.
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