Natalya Antyukh powers to 400m hurdles gold

Russia's Natalya Antyukh wins the London 2012 women's 400m hurdles gold medal after holding off the challenge of American Lashinda Demus.

Antyukh, who won bronze in the 400m in Athens in 2004, clocked a personal best of 52.70 seconds.

World champion Demus (52.77) failed to close in the final strides with Czech Zuzana Hejnova taking bronze in 53.38.

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