Decked out in white with red neckerchiefs, usually after a night of heavy drinking, the bull runners raced the toros on day one of the San Fermin week-long festival in Pamplona, northern Spain.
The 850-metre run from holding pen to the city bull ring, took just 2 minutes and 25 seconds.
The Red Cross said four people were taken to hospital with minor injuries.
The event is imortalised in Ernest Hemingway’s 1926 novel ‘The Sun Also Rises’.
The bulls taking part are killed by matadors in the evening and the meat distributed to restaurants across the city.
Fifteen people have lost their lives since records began in 1924.