American Dawn Harper sprung a huge surprise when a dramatic mistake by compatriot Lolo Jones let her through to win Olympic gold in the women's 100 metres hurdles.
Jones, the fastest woman in the world this year, looked to be cruising to victory when she clattered into the penultimate hurdle, knocking her off her stride, and Harper surged across the line to win her first major title.
It needed a photo to separate the next four runners, who all finished within two hundredths of a second of each other.
After a couple of minutes' wait, Australia's Sally McLellan was awarded silver and Canadian Priscilla Lopes-Schliep bronze with the same time of 12.64.