Fighting bulls trampled over runners on Wednesday in the fastest running of the bulls in 21 years at Spain's San Fermin festival. According to officials, seven people were injured.

The injured ranged from age 20 to 56 and included three Americans and a French citizen, organizers said. Among the three Americans, a 31-year-old New Yorker dislocated his shoulder and a 20-year-old from Chicago injured his chin and bruised his back in a fall.

Every year between 200 and 300 participants in the run are injured, around three percent seriously. Most are hurt after falling but some are trampled or gored by the bulls despite increased safety measures.

The last death occurred two years ago when a bull gored a 27-year-old Spaniard to death, piercing his neck, heart and lungs with its horns in front of throngs of tourists.

Four men have been gored so far this year at the festival, including two at Tuesday's bull run.

On Wednesday, the six bulls and six steers charged 846.6 meters from a pen to the northern city of Pamplona's bullring in just two minutes 11 seconds, the swiftest since 1990, a festival spokeswoman said.

The final bull run will be held on Thursday, the last day of the San Fermin festival.

Here's a look at the Running of the Bulls:

Bull Run 1 of 7
A heifer charges at a reveler at Pamplona's bullring. REUTERS
Bull Run 2 of 7
Victoriano del Rio fighting bulls cross the town hall square during the sixth running of the bulls at the San Fermin festival in Pamplona July 12, 2011. Two people were gored in a run that lasted two minutes and 16 seconds, according to local news sources. REUTERS
Bull Run 3 of 7
A photographer takes pictures from a small opening of Victoriano del Rio fighting bulls taking the Estafeta corner. REUTERS
Bull Run 4 of 7
A runner falls in the way of two Victoriano del Rio fighting bulls and a steer at the entrance to the bullring. REUTERS
Bull Run 5 of 7
A runner is caught in between two Victoriano del Rio fighting bulls at the entrance to the bullring. REUTERS
Bull Run 6 of 7
A heifer charges at a reveller at Pamplona's bullring after the sixth running of the bulls at the San Fermin festival in Pamplona. REUTERS
Bull Run 7 of 7
Runners sprint and fall next to Victoriano del Rio fighting bulls at Telefonica corner. REUTERS