Bolt pulls up injured in final race as Britain take stunning 4x100 metres relay gold at IAAF World Championships

Bolt pulls up injured in final race as Britain take stunning 4x100 metres relay gold at IAAF World Championships

Usain Bolt endured a desperately disappointing ending to his glittering career as he sustained an injury during the final leg while Britain powered through to secure a shock 4x100 metres relay victory in a dramatic race at the International Association of Athletics Federations (IAAF) World Championships here tonight.