Pamplona, Spain — A bull takes a tumble at the Estafeta corner during the second running.

PHOTOGRAPH BY: Alvaro Barrientos / Associated Press

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Pamplona, Spain — A bull takes off a runner's shirt.

PHOTOGRAPH BY: ANDER GILLENEA / AFP / Getty Images

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Pamplona, Spain — A boy reacts in fear as an enormous puppet lifts up his hat during a parade of costumed characters.

PHOTOGRAPH BY: SUSANA VERA / Reuters

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Pamplona, Spain — A runner is trampled during the second running at the San Fermin festival.

PHOTOGRAPH BY: ELOY ALONSO / Reuters

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Pamplona, Spain — Revelers try to keep ahead of the bulls on the Estafeta corner.

PHOTOGRAPH BY: Alvaro Barrientos / Associated Press

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Pamplona, Spain — A couple kiss after the running of the bulls.

PHOTOGRAPH BY: Daniel Ochoa de Olza / Associated Press

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Pamplona, Spain — People toss a girl into the air in the early hours before the San Fermin running of the bulls.

PHOTOGRAPH BY: Denis Doyle / Getty Images

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Pamplona, Spain — A calf, used to amuse revelers, jumps into the arena after the running of the bulls at the San Fermin fiesta.

PHOTOGRAPH BY: Ivan Aguinaga / Associated Press

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Pamplona, Spain — Runners take their places before the first bull run.

PHOTOGRAPH BY: SUSANA VERA / Reuters

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Pamplona, Spain — Participants run with fighting bulls during the first San Fermin festival bull run. The festival is a symbol of Spanish culture that attracts thousands of tourists to watch the bull runs.

PHOTOGRAPH BY: PEDRO ARMESTRE / AFP / Getty Images

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Pamplona, Spain — A runner is turned around by a young bull after finishing the first run of the festival. Four people were lightly injured in the bull run.

PHOTOGRAPH BY: JESUS CASO / EPA

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Pamplona, Spain — A man tries to avoid a steer that broke away from the pack of fighting bulls during the second day of the festival.

PHOTOGRAPH BY: Denis Doyle / Getty Images

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Pamplona, Spain — A runner falls next to a steer during the first bull run.

PHOTOGRAPH BY: ELOY ALONSO / Reuters

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Pamplona, Spain — Revelers run next to fighting bulls.

PHOTOGRAPH BY: Ivan Aguinaga / Associated Press

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Pamplona, Spain — An image of Saint Fermin is carried through the streets. People come from all over the world to test their bravery in the daily bull runs and enjoy the festival's nonstop street parties until July 14.

PHOTOGRAPH BY: Ivan Aguinaga / Associated Press

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Pamplona, Spain — Revelers run as people look on from the balconies during the first running of the bulls at the San Fermin festival.

PHOTOGRAPH BY: Alvaro Barrientos / Associated Press

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Pamplona, Spain — A festival-goer jumps from a fountain to be caught by the crowd during beginning of the San Fermin festival. The festival includes the running of bulls through the historic heart of the town for eight days starting July 7 and was central to the 1926 novel "The Sun Also Rises" by Ernest Hemingway.

PHOTOGRAPH BY: Denis Doyle / Getty Images

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Pamplona, Spain — Young women celebrate during the opening of the San Fermin festival in the town square.

PHOTOGRAPH BY: JAVIER SORIANO / AFP / Getty Images

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Pamplona, Spain — People wearing red scarves stand on balconies during the start of the San Fermin festival.

PHOTOGRAPH BY: PEDRO ARMESTRE / AFP / Getty Images

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Pamplona, Spain — Revelers are showered with water during the start of the San Fermin festival. The annual festival, best known for its daily running of the bulls, kicked off Wednesday with the traditional "chupinazo" rocket launch and will run until July 14.

PHOTOGRAPH BY: ELOY ALONSO / Reuters

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Pamplona, Spain — Thousands of people wave red scarves as they crowd the Plaza Ayuntamiento after the setting off of the "chupinazo" rocket to announce the start of the festival.

PHOTOGRAPH BY: JOSU SANTESTEBAN / EPA

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Pamplona, Spain — A man is tossed by fellow revelers on the opening day of the festival.

PHOTOGRAPH BY: PEDRO ARMESTRE / AFP / Getty IMages

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Pamplona, Spain — A group of people link arms to catch a reveler in Pamplona's square after the firing of the "chupinazo" rocket at the start of the San Fermin festival.

PHOTOGRAPH BY: JOSU SANTESTEBAN / EPA

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Pamplona, Spian — Participants hold the traditional red scarf of the San Fermin festival.

PHOTOGRAPH BY: PEDRO ARMESTRE / AFP / Getty Images

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Pamplona, Spain — Festival-goers celebrate the beginning of the San Fermin festival in the town square.

PHOTOGRAPH BY: Denis Doyle / Getty Images Europe

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Pamplona, Spain — A reveler kisses the traditional red scarf.

PHOTOGRAPH BY: Alvaro Barrientos / Associated Press

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