UK cops follow trail of gunman

Shooter's twin may be one of the victims

WHITEHAVEN, England - Baffled police were trying on Thursday to work out why a quiet taxi driver gunned down 12 people around England's serene Lake District, as Britain debated how to prevent a repeat of its worst rampage in years.

Derrick Bird's shooting spree on Wednesday through sleepy towns, villages and beautiful countryside in one of Britain's top tourist spots stunned locals and the entire country, and left authorities grappling for answers.