An historic run for Qatar's first female Olympic track athlete, Noor Al-Malki, was ended by injury.
The 17-year-old failed to finish her 100m heat after appearing to pull a hamstring as she came out of the blocks at London's Olympic stadium.
Al-Malki, dressed in a maroon running suit and cap, limped off the track with the help of officials after bursting into tears.
She is one of four females competing for Qatar in London.
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