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.
The coroner has ruled that the deaths of three members of the same family, and their shooter, could have been avoided.
An inquest has heard how a man who went on to kill three members of his family before turning the gun on himself had been warned by police.
The inquest into the deaths of a man who shot himself and three members of his family on New Years Day 2012 has been taking place today.