Revelers celebrate on the City Hall Square after

Revelers celebrate on the City Hall Square after the firing of the 'Chupinazo' rocket which marked the official beginning of the Fiestas de San Fermin in Pamplona. The festival, locally known as Sanfermines, is held annually in commemoration of the city's patron saint. Hundreds of thousands of visitors from all over the world attend the fiesta. Many of them physically participating in the highlight event, the running of the bulls, where they attempt to outrun the bulls along a 825 meter route through the narrow streets of the old city.