Revelers crowd together on the opening day, or “Chupinazo,” of the San Fermin Running of the Bulls fiesta on July 6, 2015, in Pamplona, Spain. #

People hold up their red handkerchiefs during the Chupinazo of the San Fermin fiesta on July 6, 2015, in Pamplona, Spain. #

Revelers celebrate during the launch of the Chupinazo rocket, which marks the official opening of the 2015 San Fermin fiesta. #

A band plays among the crowd during the opening day of San Fermin on July 6, 2015. #

Revelers hold up traditional red neckties during the launch of the Chupinazo rocket, at the opening of the 2015 San Fermin festival on July 6, 2015. #

A woman throws wine during a party at the official opening of the 2015 San Fermin fiesta in Pamplona on July 6, 2015. #

A reveler jumps from a fountain toward his friends as they celebrate the opening of San Fermin on July 6, 2015. #

People celebrate the opening of the 2015 San Fermin fiesta on July 6, 2015. #

Festivalgoers cool off with water poured from a balcony in the Pamplona town square on July 6, 2015. #

Revelers enjoy the atmosphere during the Chupinazo of the San Fermin fiesta on July 6, 2015. #

A flaming false bull known as a “Toro de fuego” runs after revelers during the 2015 San Fermin fiesta in Pamplona on July 6, 2015. #

A rocket signaling the beginning of the San Fermin festival is fired between the Spanish and Basque flags in Pamplona on July 6, 2015. #

Runners flee ahead of Jandilla ranch fighting bulls during the running of the bulls on July 7, 2015. #

El Tajo y La Reina fighting bulls run through revelers at the San Fermin festival on July 8, 2015. #

Participants run with Jandilla's fighting bulls along the Calle Estafeta during the second day of the San Fermin festival on July 7, 2015. #

A steer, left, and a Jandilla fighting bull, right, run after festivalgoers in Pamplona on July 7, 2015. #

A steer jumps over a fallen runner as two Jandilla fighting bulls follow behind at the Mercaderes curve during the first running of the bulls on July 7, 2015. #

A runner falls in front of Tajo y la Reina fighting bulls at the entrance to the bullring during the second running of the bulls on July 8, 2015. #

People watch as Jandilla fighting bulls and runners pass below in Pamplona on July 7, 2015. #

An injured runner gives a thumbs up as he is attended by medical personnel after being gored by a Jandilla fighting bull at the San Fermin Festival on July 7, 2015. #

A steer jumps over a group of revelers into the bullring in Pamplona on July 8, 2015. #

A reveler is tossed by a steer during a celebration held at the bullring after the running of the bulls on July 7, 2015. #

A runner is knocked by a steer during the second running of the bulls on July 8, 2015. #

A runner flees from a steer in the bullring after the running of the bulls in Pamplona on July 7, 2015. #

A steer leaps over revelers into the bull ring after the second running of the bulls on July 8, 2015. #

A reveler is tossed by a steer during a celebration held at the bullring at the San Fermin festival in Pamplona on July 7, 2015. #

People watch Spanish mounted bullfighter Pablo Hermoso de Mendoza perform during a horseback bullfight in Pamplona on July 6, 2015. #

Spanish bullfighter Juan Jose Padilla leaves the bullring's chapel before performing at a bullfight at the San Fermin festival on July 7, 2015. #

Spanish bullfighter Pepe Moral performs with a Jandilla ranch fighting bull during the San Fermin festival on July 7, 2015. #

Revelers enjoy the atmosphere inside Pamplona bullring during a bullfight on the second day of the San Fermin festival on July 7, 2015. #