Thousands of daredevil runners charged for the third day ahead of six fighting bulls of the annual San Fermin festival on Monday, when the three were gored by the animal that broke free from the pack just before entering the city's bullring, a Navarra government statement said.
The bull charged the runners as they huddled on the ground beside a wooden fence, trying to protect themselves from the beast. After several moments of tension, the animal was lured away by stick-wielding cowherds.
None of the three was seriously injured.
The morning runs are the highlight of the annual San Fermin festival, which became world famous with the publication of Ernest Hemingway's 1926 novel “The Sun Also Rises.”
The regional government said one Briton, aged 20, was gored in the right leg while the other, aged 29, was gored in the left leg. The American, aged 39, was gored in the right calf muscle.
The three, identified only by their initials, were taken to the city's Navarra Hospital.
The Spanish Red Cross' preliminary report had put the number of people gored at two.
Four other people were treated for cuts and bruises sustained in the adrenaline-fueled dash along the 849-meter (928-yard) course Monday. The run lasted just over three minutes.
The bulls from the Cebado Gago breeding ranch were herded from a holding pen in the city center to the bullring, where they are normally killed by matadors in afternoon bullfights.
Fifteen people have been killed by bulls in the runs since record began to be kept in 1924.
The runs take place daily until July 14 and are broadcast on state television.