Running of the bulls: San Fermin festival in Pamplona, Spain in full swing

Revelers from around the world turned out here to kick off the festival with a messy party in the Pamplona town square, one day before the first of eight days of the running of the bulls glorified by Ernest Hemingway's 1926 novel "The Sun Also Rises." Revelers run away followed by a flaming fake bull "Toro de fuego" during the second day of the 2014 San Fermin fiestas in Pampalone, Spain. (Source: AP)

Revelers hold up traditional red neckties during the launch of the "Chupinazo" rocket, to celebrate the official opening of the 2014 San Fermin fiestas in Pamplona. (Source: AP)

Revelers celebrate during the launch of the 'Chupinazo' rocket, to celebrate the official opening of the 2014 San Fermin fiestas. (Source: AP)

Revelers run ahead ''Victoriano del Rio Cortes'' fighting bulls on Estafeta Street during the running of the bulls, at the San Fermin festival. (Source: AP)

Revelers run ahead ''Victoriano del Rio Cortes'' fighting bulls on Estafeta Street during the running of the bulls at the festival. (Source: AP)

A reveler sleeps as he waits to see the running of the bulls. (Source: AP)

Spanish bullfighter Ivan Fandino performs during a bullfight of the San Fermin festival. (Source: AP)

Revelers run in front of Garcigrande ranch fighting bulls during a running of the bulls at the San Fermin festival, in Pamplona, Spain. (Source: AP)

Spanish bullfighter Alejandro Talavante performs with a Garcigrande ranch fighting bull during a bullfight of the eight day festival. (Source: AP)

A handkerchief hangs on the wall next to an image of San Fermin outside a building. (Source: AP)

The bulls are invariably killed in afternoon bullfights. A Torrestrella ranch fighting bull bleeds during a bullfight. (Source: AP)

A street seller puts pins to sell with typical white and red colors, at the San Fermin festival. (Source: AP)