The Independent Police Complaints Comission (IPCC) has published a report highlighting failings in the working practices of the Southwark Sapphire Unit - a police department dedicated to investigating rapes and other cases of serious sexual violence.
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Rebecca Casserly was on her way to buy a coffee in north London when her phone was suddenly snatch from her hand by a man riding a bike.
Lee Curley took more than 120 pictures and videos of his attacks on the girl, said to be under the age of 13.
Council workers uncovered the AK-74 concealed in the undergrowth.