A total of 802 gang offenders are in custody according to the latest data released by the Met. A further 101 gang offenders are subject to ASBOs, gang injunctions or other court orders and 105 have been released from prison with licence conditions.
These restrictions can have a range of conditions, including restricting who gang members can associate with, where they can go and even put restrictions around their use of mobile phones.
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Martin Allen, 15, disappeared on his way home from school in London in 1979 and was never seen again.