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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Detectives investigating the Parsons Green terrorist attack have arrested a 17-year-old boy in Thornton Heath, south London.
Speaking to ITV News Foreign Office minister Tobias Ellwood said education was the greatest weapon in the fight against extremism.
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