Great Britain claimed their first 4x100m relay gold at the World Championships as Usain Bolt pulled up injured in his final race.
They held off the USA, who were favourites, to win in a British record time of 37.47 seconds.
Bolt, running the anchor leg for Jamaica, suffered his injury 50m from the finish line in London.
The 30-year-old, who took 100m bronze in his final solo race, ends his career with 11 world and eight Olympic golds.
More to follow.