1 August 2012 Last updated at 23:44

Olympics swimming: Rebecca Soni breaks breastroke world record

American Rebecca Soni secures a place in the 200m breaststroke final by setting a new world record of two minutes and 20.00 secs.

Her time erased 0.12 off the previous world record of 2:20.12, set by Canada's Annamay Pierse at the 2009 world championships in Rome.

Soni qualified for Thursday's final more than two seconds ahead of her nearest rival, Denmark's Rikke Pedersen.

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