A heifer charges at a reveller at Pamplona's bullring after the sixth running of the bulls at the San Fermin festival in Pamplona July 12, 2011. [Photo/Agencies]

Runners sprint and fall next to Victoriano del Rio fighting bulls at Telefonica corner during the sixth running of the bulls at the San Fermin festival in Pamplona July 12, 2011. [Photo/Agencies]