Bulls chase daredevils through Pamplona's narrow streets

A reveller is thrown into the air during the opening the San Fermin festival in Pamplona, Spain, on July 6, 2018. 

Participants drank and sprayed sangria ahead of the opening of the festival which draws tourists from around the world for its daily bull runs in the city's narrow streets.

Runners dodge bulls during the second bull run of the festival on July 8.

The 930-yard course leads to the city's bullring, where the bullfights, or corridas, are held.

Runners and bulls enter the ring on July 10.

Revellers protect themselves as a calf jumps over them in the bullring on July 10.

Revellers dodge a "Kiliki" ready to hit with his sponge during the festival's "Comparsa de gigantes y cabezudos" (Parade of the Giants and Big Heads) on July 8.

The festival was immortalized by Ernest Hemingway in his 1926 novel "The Sun Also Rises," and draws around one million visitors annually.

A runner stumbles in front of bulls on July 10.

Four Americans and three Spaniards survived last year after they were gored by bulls, while dozens other suffered injuries and bruises, mostly due to falls during the race.

Bullfighter Octavio Cachon prepares to enter the bullring on July 9.

A bull stumbles on July 9.

Runners, or "mozos," are chased by bulls on July 9.

Runners pray before the bull run on July 9.

Owners of private balconies overlooking the action charge spectators to view the bulls and the runners careening down the town's ancient streets.

A runner receives medical attention on July 9.

Spanish bullfighter Jose Garrido is tossed by a bull on July 7.

Bullfights are protected under Spain's constitution as part of the country's cultural heritage.