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A runner is gored by an "El Pilar" fighting bull during the running of the bulls at the San Fermin festival, in Pamplona, Spain, Friday, July 12, 2013. Revelers from around the world arrive to Pamplona every year to take part in some of the eight days of the running of the bulls glorified by Ernest Hemingway's 1926 novel "The Sun Also Rises." (AP Photo/Alvaro Barrientos)

Running of the bulls in Pamplona (graphic warning)

An American and two Spaniards were gored on July 12 during a danger-filled bull run of Spain's San Fermin festival, with one loose bull

causing panic in the packed streets of the city of Pamplona. (AP)