A report from the Independent Police Complaints Commission has found failings in the working practices of the Metropolitan Police's Sapphire sex crime unit between July 2008 & Sept 2009.
It found instances when officers failed to believe victims and in one example, a woman was pressured to drop a rape claim against a man who went on to murder his two children.
Deputy chairwoman of the IPCC Deborah Glass said it was a sorry chapter of the Sapphire Unit’s history.
"The pressure to meet targets as a measure of success, rather than focusing on the outcome for the victim, resulted in the police losing sight of what policing is about – protecting the public and deterring and detecting crime."
More top news
A former British soldier who served in Afghanistan is one of a 'growing number' of westerners joining Kurds in the fight against Isis.
Growing numbers of people on low incomes are turning to food banks to survive, new research has revealed.
It will be cold and frosty across the north of the UK tonight, with some icy patches in the west.