The critical IPCC report looked into why murderer Michael Atherton had a firearms licence, when he had a history of domestic violence.
Atherton shot Susan McGoldrick, Alison Turnbull and her daughter Tanya Turnbull before turning the gun on himself in Horden, County Durham.
More top news
'There's still hope - albeit only a teeny, tiny glimmer of it'
An entire North Yorkshire village which was put on the market a year ago for £20 million has been sold for an 'undisclosed' fee.
Middlesbrough 1 Sunderland 0