New Delhi, July 13 -- A runner was gored in the face and many more were fortunate to not be seriously injured during a chaotic bull run at Spain's San Fermin festival on Saturday.

The six bulls and accompanying steers charged through crowds of thrill-seekers who packed the narrow street course in Pamplona. The huge animals knocked down bodies to the cobblestones, and stumbling runners caused several pileups during the two-and-a-half-minute run from the pen to the bull ring where bullfighters will kill the bulls later in the day.

One runner was pierced by a horn in the face, while 12 more people needed medical treatment for an assortment of knocks, according to the University of Navarra Hospital.

A black bull broke away from the pack ea...