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The annual Fiesta de San Fermin began in Spain this week. The festival, including the famous “Running of the Bulls,” attracts thousands of visitors to Pamplona every year.

Lasting nine days, the festival kicks off with massive crowds at the Chupinazo in Pamplona town square, followed by a carnival, fireworks, the running of the bulls, and many bullfights.

Held since 1591, San Fermin remains a popular, though dangerous and controversial, event—two Americans and a Briton were gored on Tuesday.

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.

A band plays among the crowd during the opening day of San Fermin.

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

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

Revelers enjoy the atmosphere during the Chupinazo of the San Fermin fiesta.

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.

Participants run on Santo Domingo in front ''Jandilla'' fighting bulls during the running of the bulls at the San Fermin Festival in Pamplona 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.

Revellers run with Jandilla's fighting bulls along the Calle Estafeta during the second day of the San Fermin.

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

Revelers run with the Tajo and the Reina's fighting bulls entering Estafeta street during the third day of the San Fermin running of the bulls festival.

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 Jandilla bull charges at a participant during the first "encierro" (bull-run) of the San Fermin festival on July 7.

An unidentified runner gestures while being attended by medical services following the first running of the bulls on July 7.

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.

A wild cow, or 'vaca', leaps over participants as it enters the bullring during the Fiesta de San Fermin in Pamplona on July 8

A steer jumps over a group of revelers into the bullring in Pamplona.

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 after the running of the bulls on July 7, 2015.

A runner is knocked by a steer during the second running of the bulls.

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

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.

Spanish bullfighter Pepe Moral aims his sword before killing a Jandilla ranch fighting bull with it during a bullfight of the San Fermin festival in Pamplona.