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.
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Now, the remaining three will battle it out for the title of King or Queen of the Jungle 2016.
The gallery is the only British museum on the list of 46 nominees from 24 countries.
'Disappointed but not downhearted.'