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23 January 2015, 17:21
The police watchdog is looking at whether information about a paedophile from Cardiff was acted on quickly enough.
Former teacher Gareth Williams was among a group of sex offenders monitored by Canadian police.
They passed information to the Child Exploitation and Online Protection Centre but there was a delay of a year before the police were informed.
48 year old Gareth Williams was jailed for 5 years at Cardiff Crown Court last May after admitting a number of child sex offences.