Usain Bolt wins ninth Olympic gold as Jamaica clinches 4x100m relay title

Usain Bolt has won triple triple of Olympic golds on a historic night in Rio.
The Jamaican, who already had gold medals from victories in the 100m and 200m under his belt, took the title in the men's 4x100m relay.
Assisted by teammates Asafa Powell, Yohan Blake and Nickel Ashmeade, Bolt raced to his ninth gold in his Olympic career.Bolt's incredible ninth - and last - gold joins his three in Beijing in 2008 and three more in London four years ago.
The world's fastest man, celebrates his 30th birthday on Sunday.