A minute's silence will be observed in Wales today on the 50th anniversary of the Aberfan disaster.
Investigation Into Welsh Paedophile
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.
Tragedy struck in the village of Aberfan 50 years ago - here's how the disaster unfolded.
Even with the coal tips removed, the landscape of Aberfan still lives in the shadow of tragedy.
50 years after the Aberfan disaster these photos remain some of the most haunting and iconic images.
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