framed by police, BBC Panorama has found. Police knew the testimony of the main prosecution witness in the trial of Omar Benguit for the murder of South Korean student Jong-Ok Shin was directly contradicted by CCTV evidence, we have learned. A total of 13 other witnesses used to support the prosecution case have now told the BBC the police pressured them to embellish their statements or lie in court. Dorset Police did not directly address the suggestion that officers had framed Benguit, but said its investigation was "thorough, detailed and very complex".

Jong-Ok Shin - known as Oki - was stabbed to death while she was walking home from a Bournemouth nightclub in 2002. Benguit, an addict with a history of drug and knife crime, was convicted at a third trial in 2005, after two previous juries failed to reach verdicts. The BBC has investigated this case over nine years, previously reporting that some witnesses had said they gave false evidence after being pressured by police. But Panorama's latest investigation reveals:

·      Phone records suggest Benguit had an alibi that discredited the evidence of the main witness and the police buried it

·      Police built their case around the testimony of a proven liar, even though they knew CCTV footage contradicted her story

·      Two additional witnesses say they lied in court after police pressured them

·      Four more people told the BBC that officers had tried to get them to give false evidence and they refused

·      The evidence of all the key prosecution witnesses has now been undermined or discredited.