The Russian athletics federation filed a protest on Tuesday against the result of the Olympic 100 metres hurdles final after Irina Shevchenko was felled at the first barrier.

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Pre-race favourite Perdita Felicien of Canada crashed into the first flight, veered into the adjoining lane and fell to the track, bringing down Shevchenko.

"A jury of appeal will hear the protest tonight," said International Association of Athletics Federations spokesman Nick Davies. "Theoretically they could rerun the race."

American Joanna Hayes was first across the line, in a Games record 12.37 seconds, followed by Olena Krasovska of Ukraine and Melissa Morrison, also of the United States.