Operation Beaconport - a National Crime Agency project tasked with unearthing failings to tackle grooming gangs - is set to look at thousands of cases where police forces and the Crown Prosecution Service decided to take no further action against suspects.
Police say that there appear to be cases where lines of inquiry were not pursued properly, victim accounts were not taken, and suspects were not interviewed as they should have been.
Investigations that were wrongly closed with no further action taken have already been discovered.
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