Seven people have been gored at Pamplona's running of the bulls festival in Spain.Among the injured on day six of the event were two Americans, a Mexican, a Pole and a Norwegian. A German, a Frenchman and three Spaniards were also treated for other injuries.The injuries are no great surprise when you consider the nature of the festival - thousands of runners, mostly drunk men, run through Pamplona's streets as bulls are herded to a bullring.The San Fermin running of the bulls is an ancient tradition that was made famous by Ernest Hemingway's novel, The Sun Also Rises. The bulls are later killed by bullfighters.The book is a semi-autobiographical account of an alcohol-fuelled visit to the festival by a group of British and American friends in the 1920s.Three of Thursday's injured, including the Mexican, who was gored in the abdomen and thigh, are in very serious condition and need surgery.© Independent Television News Limited 2007. All rights reserved.