A grudge held by crazed killer Derrick Bird against his twin brother over his father’s will may have sparked a massacre which left 12 people dead.

THE family of gunman Derrick Bird were last night struggling to understand what turned the quiet taxi driver into a mass killer.

TWELVE people were killed and 11 were wounded when taxi driver Derrick Bird went on a gun rampage.

The family of gunman Derrick Bird were tonight struggling to understand what turned the quiet taxi driver into a mass killer.

British police were today investigating what sparked gunman Derrick Bird's killing spree amid reports he was involved in a bitter family feud.