People running with bulls during the first day of the "Running of the Bulls" in the municipality of San Sebastian de los Reyes, near Madrid, also known as "Little Pamplona" on Tuesday. Pamplona is the capital city of the Autonomous Community of Navarre in Spain. /VCG Photo

The Running of the Bulls is an annual event usually held as part of a summertime festival in Spain, which was called "encierro" in Spanish. /VCG Photo

This Spanish tradition began in northeastern Span in the early 14th century. At that time, the traders tried to increase the speed of transporting cattle in order to sell them in the market by using strategy of fear and excitement to run of the cattle, and then the tradition continue to exist until today. /VCG Photo

On the other hand, some people say that the traditional sport is cruel and it should be banned. According to the city council of Pamplona, between 50 and 100 people are injured during the event every year. /VCG Photo