The author of a book on how to survive bull-running ended up in hospital this week after being gored by one of the ferocious animals.
Three men, who were among thousands of daredevils at the annual San Fermin bull running festival, have been gored by a runaway animal.
Revellers from around the world kicked off the famous bull running festival on Friday with a party in Pamplona's town square.
Four people have been gored during the sixth bull run of Spain's San Fermin festival, causing panic in the streets of Pamplona.
One bull charged a young man and pushed him around on the ground with its horns for almost 30 seconds, as his fellow runners tried to pull the animal away by its tail.
The man was eventually dragged away to safety by his feet.
The gorings were the first of this year's festival, during which the crowds test their skills by running with six fighting bulls through the streets of Pamplona to the bullring.