Usain Bolt, Yohan Blake and Warren Weir receive sprint medals

Usain Bolt became the first man to retain both Olympic sprint titles as he led home a gold and green Jamaica clean sweep in the 200m.

Bolt matched Michael Johnson's then world-record time from the Atlanta Games of 19.32 seconds as he held off training partner Yohan Blake in silver and Warren Weir in bronze.

Blake's 19.44 secs was a season's best, while 22-year-old Weir set a new personal best with 19.84 secs to complete the Jamaican party.