The number of thrill-seeking revelers at the sixth day of the San Fermin festival's running of the bulls in Pamplona has swelled to thousands but no one was gored.

Red Cross spokesman Alfonso Contin said initial reports indicated only a possible broken arm in Sunday's bull run.

This run featured bulls from the Conde de la Maza breeder — weighing in between 1,235 and 1,367 pounds (560-620 kilograms). Although the beasts pushed and shoved runners aside as they thundered through the streets, there were no serious incidents.

The nine-day fiesta, held annually to honor the northern city's patron saint, dates back to the late 16th century. It became world-famous after Ernest Hemingway featured it in his 1926 novel "The Sun Also Rises."