The IPCC has previously said that it was investigating Durham Police's decision to return shotguns to triple murderer Michael Atherton.
Earlier it revealed that its report is 'highly critical' of Durham Police, who knew that Atherton had a history of domestic violence.
More top news
Tech giants Facebook and Google both have simple, powerful tools to help friends and family keep track of loved ones
The dangerous Khumbu icefall has been rendered impassable after an avalanche, trapping climbers on Mt Everest. Here's what you need to know.
Emma Jesson brings you Sunday night's forecast