London: Usain Bolt led Jamaica to the 4x100 metres Olympic gold in a world record time Saturday.
Bolt took on the baton with a one-metre lead and powered away from America`s Ryan Bailey to cross the line in 34.84 seconds.
It was two-tenths of a second inside the world record Bolt, Nesta Carter, Michael Frater and Yohan Blake set at the world championships last year.
The American team of Bailey, Trell Kimmons, Justin Gatlin and Tyson Gay equalled the old world record for silver in 37.04.
Trinidad and Tobago`s quartet claimed the bronze in 38.12 after the third-placed Canadians were disqualified.
Bolt became the first sprinter to retain both sprint gold medals after winning the 100 and 200 metres races in London.