Every year, the Festival of San Fermin attracts thousands of visitors to Pamplona, Spain. Over the course of nine days, the festival hosts many bullfights, a carnival, fireworks, and of course, the encierro, or "running of the bulls." Held since 1591, San Fermin remains a popular, if also dangerous and controversial event: Several people have been gored already this year, and the festival continues until July 14th. Collected below are some scenes from the first few days of this 2011's Festival of San Fermin.