Paralympics: Pistorius retains 400m title with new world record

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'Blade Runner' Oscar Pistorius on Saturday brought the Paralympic track and field programme to a close in style, winning his favoured event by a huge margin in a new world record time.

Victory for the 25-year-old South African never looked in any doubt from the gun, as he struck out on his own to lead coming into the last half-lap and was roared across the line by the packed 80,000-capacity Olympic Stadium in 46.68sec.

US athletes Blake Leeper took silver in 50.14sec with David Prince in bronze on 50.61.

Pistorius - the only man in the field to run under 50sec for the one-lap sprint and the first double-amputee to compete at the Olympics last month - won the 100m, 200m and 400m treble in Beijing four years ago.

But he lost both of the shorter sprint titles to Britain's Jonnie Peacock and Alan Oliveira of Brazil.