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26 February 2013, 11:30
The police watchdog says officers from a Met Police sex crime unit pressured a woman to drop a rape claim against a man who went on to murder his two children.
Jean Say killed his son and daughter two years ago when they went to stay with him for a weekend.
The earlier rape allegation against him was dismissed by a detective sergeant based in the Sapphire unit at Southwark, who said the circumstances did not constitute rape because the woman "consented".
A report by the Independent Police Complaints Commission says: "There is no doubt from the evidence that the woman made an allegation of rape at Walworth police station which should have been believed and thoroughly investigated."