"Running with the bulls", as it is often dubbed, is a centuries-old Spanish tradition.
However, now that we live in a world where animal rights are at the forefront of many people's minds, the event has come under fire - not only because of the treatment of the bulls, who are shot after the event - but because of the danger it poses to participants.
This year's event in Panama saw five people injured, with two of them requiring brain scans.
The event was held as part of the seven-day long San Fermín festival, which includes a number of other historical and folkloric events.
People have been killed by running with the bulls in the past, but this has not deterred the thousands who continue to do it each year. The Guardian has reported that while there were injuries at this year's event, there were no fatalities.
To make the event safer, the streets are sprayed with an anti-slip substance, but this has been criticized by attendees.
In an interview with Euronews, David Hurte, a participant, said: "You spend a lot of money to come here and risk your life but over the years more importance has been given to the control of the bulls. It's a shame."
Alberto Buitrago told Sky News: "The steers are over-trained. They block off the bulls via an arrow formation and keep the bulls away from the runners. We're losing all the essence of the bull run."
The event takes place over the course of half a mile and has been slammed by animal right's campaigners; many of whom have said that participants have no idea that the 12 released bulls are systematically slaughtered at the end of the event.
PETA campaign manager Jordi Casamitjana described the event as "barbaric" to the Guardian.
He said: "Most of the protesters are Spanish. The reality is that the majority of Spaniards are against bullfighting. A lot of people don't come to Pamplona in July because of San Fermín and a lot more tourists would come here if they banned it."
