An assistant to a Spanish mounted bullfighter waits on the sidelines during a horseback bullfight at San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. Revelers from around the world 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. (Photo by Alvaro Barrientos/AP Photo)

Revelers celebrate during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. (Photo by Alvaro Barrientos/AP Photo)

Revelers are sprayed with water as they celebrate during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin fiestas in Pamplona, Spain, Monday, July 6, 2015. (Photo by Daniel Ochoa de Olza/AP Photo)

People watch Spanish mounted bullfighter Pablo Hermoso de Mendoza perform during a horseback bullfight at San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. (Photo by Alvaro Barrientos/AP Photo)

Members of the Gaiteros musician group gesture in front of the City hall, back, while celebrating during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. (Photo by Alvaro Barrientos/AP Photo)

Revelers shout as girls pull up their t-shirts during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin festival in Pamplona, Spain, Monday, July 6, 2015. (Photo by Andres Kudacki/AP Photo)

Revelers try to walk in the street during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. (Photo by Alvaro Barrientos/AP Photo)

Revelers celebrate during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. Revelers from around the world 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”. (Photo by Alvaro Barrientos/AP Photo)

Revelers celebrate during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. (Photo by Alvaro Barrientos/AP Photo)

Revelers celebrate during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. (Photo by Alvaro Barrientos/AP Photo)

Revelers celebrate during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin fiestas in Pamplona, Spain, Monday, July 6, 2015. (Photo by Daniel Ochoa de Olza/AP Photo)

Revelers open their mouths as they wait to cool off with water thrown from a balcony to celebrate the official opening of the 2015 San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. (Photo by Andres Kudacki/AP Photo)

Revelers celebrate during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin fiestas in Pamplona, Spain, Monday, July 6, 2015. (Photo by Daniel Ochoa de Olza/AP Photo)

A man representing a medieval horse rider hits revelers with a whip during the procession of Cabezudos figures on the opening of the 2015 San Fermin fiestas in Pamplona, Spain, Monday, July 6, 2015. (Photo by Andres Kudacki/AP Photo)

A reveler throws wine during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin fiestas in Pamplona, Spain, Monday, July 6, 2015. (Photo by Andres Kudacki/AP Photo)

Revelers celebrates as people throw water from the balconies during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin festival in Pamplona, Spain, Monday, July 6, 2015. (Photo by Andres Kudacki/AP Photo)

A reveler jumps towards his friends as they celebrate during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin fiestas in Pamplona, Spain, Monday, July 6, 2015. (Photo by Daniel Ochoa de Olza/AP Photo)

Revelers walks on the street while celebrate during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. (Photo by Alvaro Barrientos/AP Photo)

Revellers hold up traditional red scarves during the start of the San Fermin festival in Pamplona July 6, 2015. San Fermin festival, best known for its daily running of the bulls, kicked off today with the traditional “Chupinazo” ocket launch and will run until July 14. (Photo by Reuters/Stringer)

A Basque flag called the Ikurrina flies alongside traditional red scarves held up by revellers during the start of the San Fermin festival in Pamplona July 6, 2015. (Photo by Reuters/Stringer)

A reveller wearing earrings in the form of a bull smiles during the start of the San Fermin festival in Pamplona July 6, 2015. (Photo by Reuters/Stringer)

A reveller drinks wine during the start of the San Fermin festival in Pamplona July 6, 2015. (Photo by Reuters/Stringer)

A reveller is punched in the face by another reveller during the start of the San Fermin Festival in Pamplona, Spain, July 6, 2015. (Photo by Susana Vera/Reuters)

A reveller is tossed in the air during the start of the San Fermin Festival in Pamplona, Spain, July 6, 2015. (Photo by Susana Vera/Reuters)

A bull swims in the sea next to revellers during the “Bous a la Mar” festival in the eastern Spanish coastal town of Denia, Spain, July 6, 2015. Revellers emerge from protective barriers to provoke bulls to chase them during this festival, until they both fall into the sea. The bulls are then rescued by small boats which will tow them to safety. (Photo by Heino Kalis/Reuters)

A bull is rescued by men on a boat to tow it to safety during the “Bous a la Mar” festival in the eastern Spanish coastal town of Denia, Spain, July 6, 2015. (Photo by Heino Kalis/Reuters)

Revellers get soaked with water during the start of the San Fermin Festival in Pamplona, Spain, July 6, 2015. (Photo by Susana Vera/Reuters)

A bull chases revellers who jump into the sea during the “Bous a la Mar” festival in the eastern Spanish coastal town of Denia, Spain, July 6, 2015. (Photo by Heino Kalis/Reuters)

Revellers spit wine at each other during the start of the San Fermin festival in Pamplona July 6, 2015. (Photo by Vincent West/Reuters)

Revellers cool off with water thrown from a balcony at the start of the San Fermin festival in Pamplona, Spain July 6, 2015. (Photo by Vincent West/Reuters)

Revellers wait for the start of the San Fermin Festival in Pamplona, Spain, July 6, 2015. (Photo by Susana Vera/Reuters)

Revellers drink during the start of the San Fermin Festival in Pamplona, Spain, July 6, 2015. (Photo by Susana Vera/Reuters)

Revellers get soaked with water during the start of the San Fermin Festival in Pamplona, Spain, July 6, 2015. (Photo by Susana Vera/Reuters)

A reveller is tossed in the air at the start of the San Fermin festival in Pamplona, Spain, July 6, 2015. The festival, best known for its daily running of the bulls, kicked off today with the traditional “Chupinazo” rocket launch and will run until July 14. (Photo by Eloy Alonso/Reuters)

The municipal band plays during the start of the San Fermin festival in Pamplona, Spain, July 6, 2015. (Photo by Eloy Alonso/Reuters)

Revellers cool off with water thrown from a balcony at the start of the San Fermin festival in Pamplona, Spain, July 6, 2015. (Photo by Eloy Alonso/Reuters)

A woman is embraced by a Kiliki during San Fermin festival's “Comparsa de gigantes y cabezudos” (Parade of Giants and Big Heads) in Pamplona, northern Spain, July 6, 2015. (Photo by Vincent West/Reuters)

Women react before being hit with a sponge by a Kiliki (L) during San Fermin festival's “Comparsa de gigantes y cabezudos” (Parade of Giants and Big Heads) in Pamplona, northern Spain, July 6, 2015. “Kilikis”, wearing oversized masks as they playfully hit bystanders with sponges on sticks, parade daily through the city accompanied by brass bands during the nine-day-long festival made popular by U.S. writer Ernest Hemingway. (Photo by Susana Vera/Reuters)

Revellers squeeze alongside one another as they sing, dance and drink during the traditional Riau-Riau dance from the town hall to the Saint Fermin Chapel at San Lorenzo church on the first day of the San Fermin Festival in Pamplona, Spain, July 6, 2015. (Photo by Susana Vera/Reuters)

Revellers sit on a bull run fence during the traditional Riau-Riau dance from the town hall to the Saint Fermin Chapel at San Lorenzo church on the first day of the San Fermin Festival in Pamplona, Spain, July 6, 2015. (Photo by Susana Vera/Reuters)

Revellers block the way of the municipal music band as they sing, dance and drink during the traditional Riau-Riau dance from the town hall to the Saint Fermin Chapel at San Lorenzo church on the first day of the San Fermin Festival in Pamplona, Spain, July 6, 2015. (Photo by Susana Vera/Reuters)

Spain's rejoneador (bullfighter on horseback) Roberto Armendariz reacts after fighting a bull in the bullring on the first day of the San Fermin festival in Pamplona, Spain, July 6, 2015. (Photo by Reuters/Stringer)

A girl is held by other revelers during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin fiestas in Pamplona, Spain, Monday, July 6, 2015. (Photo by Andres Kudacki/AP Photo)

A reveler wearing white and red sits beside an official poster for the San Fermin Fiestas during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. (Photo by Alvaro Barrientos/AP Photo)

Revelers celebrate during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. (Photo by Alvaro Barrientos/AP Photo)

Revelers gathered on City Hall Square celebrate after the firing of the 'txupinazo' rocket which marked the official beginning of the Fiestas de San Fermin in Pamplona, Spain, 06 July 2015. The festival, locally known as Sanfermines, is held annually from 06 to 14 July in commemoration of the city's patron saint. Hundreds of thousands of visitors from all over the world attend the fiesta. Many of them physically participating in the highlight event – the running of the bulls, or encierro – where they attempt to outrun the bulls along a 825 metre route through the narrow streets of the old city. (Photo by Daniel Fernandez/EPA)

Revellers enjoy the atmosphere during the opening day or “Chupinazo” of the San Fermin Running of the Bulls fiesta on July 6, 2015 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)

A reveler sleeps at a square during opening of the 2015 San Fermin fiestas in Pamplona, Spain, Monday, July 6, 2015. (Photo by Andres Kudacki/AP Photo)

Revelers cool off with water thrown from a balcony during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. (Photo by Alvaro Barrientos/AP Photo)

Revelers celebrate during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. (Photo by Alvaro Barrientos/AP Photo)

A couple play as they have lunch with friends on the street to celebrate the official opening of the 2015 San Fermin fiestas in Pamplona, Spain, Monday, July 6, 2015. (Photo by Andres Kudacki/AP Photo)

Revelers celebrate during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. (Photo by Alvaro Barrientos/AP Photo)

Revelers are sprayed with water as they celebrate during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin fiestas in Pamplona, Spain, Monday, July 6, 2015. (Photo by Daniel Ochoa de Olza/AP Photo)

People look on from a balcony while they celebrate during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. (Photo by Alvaro Barrientos/AP Photo)

A reveler celebrates during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. Revelers from around the world 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. (Photo by Alvaro Barrientos/AP Photo)

Revelers celebrate during the launch of the “Chupinazo” rocket, to celebrate the official opening of the 2015 San Fermin Fiestas, in Pamplona, northern Spain, Monday, July 6, 2015. (Photo by Alvaro Barrientos/AP Photo)