Nikki Allan (centre), David Boyd (right), Nikki's mum Sharon Henderson (top left) and the Old Exchange Building in Hendon, Sunderland where Nikki Allan was murdered (bottom left) (Image: Northumbria Police/CPS/Reach Plc)

Former police officers have been told they could face criminal charges over the investigation into schoolgirl Nikki Allan's murder. The seven-year-old was killed near her home in Sunderland in 1992, but it took more than 30 years for paedophile David Boyd to be brought to justice for her murder.

The Independent Office for Police Conduct (IOPC) announced last year that it had launched an investigation into complaints about Northumbria Police's handling of the case. And today the Chronicle can reveal that the watchdog has began interviewing a number former officers und

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