Runners sprint ahead of bulls during the first running of the bulls at the San Fermin festival in Pamplona. Photo: Reuters

Madrid - One raging bull left 13 people injured on Friday during this year's eighth and final Running of the Bulls at the Sanfermin festival in Pamplona.

The bull ran the 875-metre course through the narrow streets of the northern Spanish city in two minutes and 10 seconds, faster than the other bulls that have been baited and goaded to run through the alleys every morning since July 7.

Three of those injured remain in the hospital, including one French and one US citizen with concussion, according to the Europa Press news agency.

Over the course of eight bull runs, seven people were injured by horns while dozens more were treated because of slight injuries, mostly bruises.

The nine-day Sanfermin festival attracts hundreds of thousands of people from around the world every year. According to event tradition, six bulls, some of them more than 600 kilograms in weight, and several leaders of hundreds of men and some women are chased into the arena for bullfighting.

Protests by animal welfare groups had been held this year in the run-up to the event, which remains highly controversial in Spain.

Pamplona was made famous by Ernest Hemingway and his 1926 novel "The Sun Also Rises."