Revellers enjoy the atmosphere during the opening day or “Chupinazo” of the San Fermin Running of the Bulls fiesta on July 6, 2018 in Pamplona, Spain. The annual Fiesta de San Fermin, made famous by the 1926 novel of US writer Ernest Hemmingway entitled “The Sun Also Rises”, involves the daily running of the bulls through the historic heart of Pamplona to the bull ring. (Photo by Pablo Blazquez Dominguez/Getty Images)





Revellers pack the main square during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2018 San Fermin fiestas with daily bull runs, bullfights, music and dancing in Pamplona, Spain, Friday July 6, 2018. (Photo by Alvaro Barrientos/AP Photo)





Revellers in animal masks drink wine during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2018 San Fermin fiestas with daily bull runs, bullfights, music and dancing in Pamplona, Spain, Friday July 6, 2018. (Photo by Alvaro Barrientos/AP Photo)





Revellers are splashed with water before the opening of the San Fermin festival in Pamplona, Spain, July 6, 2018. (Photo by Joseba Etxaburu/Reuters)





A female reveller is seen wearing her red San Fermin scarf around her wrist during the opening of the San Fermin festival in Pamplona, Spain on July 6, 2018. (Photo by Susana Vera/Reuters)





Revellers react after being splashed with water during the opening of the San Fermin festival in Pamplona, Spain on July 6, 2018. (Photo by Susana Vera/Reuters)





Revellers hold up the traditional red scarves during the firing of “chupinazo” which opens the San Fermin festival in Pamplona, Spain on July 6, 2018. (Photo by Susana Vera/Reuters)





Revellers hold up traditional red scarves during the firing of “chupinazo” which marks the opening of the San Fermin festivalin Pamplona, Spain on July 6, 2018. (Photo by Vincent West/Reuters)





Revellers celebrate while drinking and spraying sangria during the opening of the San Fermin festival in Pamplona, Spain on July 6, 2018. (Photo by Susana Vera/Reuters)





Revellers celebrate during the opening of the San Fermin festival in Pamplona, Spain on July 6, 2018. (Photo by Susana Vera/Reuters)





A reveller drinks wine from a shoe during the opening of the San Fermin festival in Pamplona, Spain on July 6, 2018. (Photo by Joseba Etxaburu/Reuters)





Revellers are seen before the opening of the San Fermin festival in Pamplona, Spain on July 6, 2018. (Photo by Susana Vera/Reuters)





Participants celebrate during the “Chupinazo” (start rocket) to mark the kickoff at noon sharp of the San Fermin Festival, in front of the Town Hall of Pamplona, northern Spain, on July 6, 2018. (Photo by Jaime Reina/AFP Photo)





Revellers enjoy the atmosphere during the opening day or “Chupinazo” of the San Fermin Running of the Bulls fiesta on July 6, 2018 in Pamplona, Spain. (Photo by Pablo Blazquez Dominguez/Getty Images)





Revellers play and celebrate during the opening of the San Fermin festival in Pamplona, Spain, July 6, 2018. (Photo by Joseba Etxaburu/Reuters)





Revellers enjoy the atmosphere during the opening day or “Chupinazo” of the San Fermin Running of the Bulls fiesta on July 6, 2018 in Pamplona, Spain. (Photo by Pablo Blazquez Dominguez/Getty Images)





Revellers play and celebrate before the opening of the San Fermin festival in Pamplona, Spain on July 6, 2018. (Photo by Susana Vera/Reuters)





Revellers sleep after the opening of the San Fermin festival in Pamplona, Spain on July 6, 2018. (Photo by Susana Vera/Reuters)