An inquest has heard that a police firearms officer - who was convicted of selling on guns to the public - played a part in granting a gun licence to a man who shot himself and three members of his family in County Durham.
The hearing into the Horden shootings started today.
The Independent Police Complaints Commisson has already investigated why Michael Atherton was allowed several gun licences.
Today, the inquest heard there was no formal training for Durham police officers involved in granting gun licences.
Mavis, Bobby, Davey and Robert - the members of the victims' family - spoke to ITV News about the tragic day in January.
Watch the full report from Frances Read below.