Navarra Hospital chief Javier Sesma said there were no gorings in the latest run but four people were treated in city hospitals for injuries suffered in falls.
The early-morning race, which sees thrill-seekers testing their bravery by dashing alongside six fighting bulls, lasted just over two minutes.
The nine-day fiesta immortalised in Ernest Hemingway's novel The Sun Also Rises is one of Spain's main tourist attractions.
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