An investigation will be held to find out how a man - who shot dead three
women and then himself in County Durham - was allowed to hold licences for guns. 

Michael Atherton killed his partner, Susan McGoldrick, her sister Alison
Turnbull and her niece Tanya Turnbull before taking his own life on New Year's
Day.

Police were alerted after shots were fired shortly before middnight on Sunday in Peterlee.