We are about a week late with this story, because the festival of San Fermín, in the city of Pamplona (Navarre, Spain), actually ends at midnight tonight. The most famous event of the San Fermin festival is of course the encierro, the running of the bulls.
Since 1924 13 people have been killed, the most recent was an American tourist in 1995 and over 200 have been seriously injured.
The festival was central to the plot of The Sun Also Rises, by Ernest Hemingway, which brought it to the general attention of English-speaking peoples. It has become probably the most internationally renowned fiesta in Spain.
View a video of the bull run on Google Maps