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

“YOU won’t see me again,’ Derrick Bird chillingly told a friend before embarking on a shooting spree across rural northwestern England, killing 12 people and wounding 25 others, including his mother, before turning the gun on himself.

THOSE who knew him were at a loss as to why Derrick Bird turned into a killer.