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An expert on eluding the rampaging bulls of Pamplona was taken to hospital after being badly gored in his right thigh.

Bill Hillman, 32, who co-wrote the book How to Survive the Running of the Bulls, tripped and fell during the morning run today, according to Pamplona's San Fermin festival website.

The heaviest of the morning's six beasts, a 600kg fighting bull named Brevito injured him.

(Image: Reuters)

Hillman, from Chicago, is a renowned fan of the festival, which features chaotic stampedes through the narrow streets of Pamplona's old town.

A 35-year-old Spanish runner was also hurt in the morning 'encierro', where runners in white outfits and red scarves are pursued by the huge animals.

He sustained serious injuries after being gored in the chest.

It was the third run of the festival, which takes place over the course of a week.

(Image: Reuters)

A Spanish regional government spokesman said the two men were in a serious condition and being treated in hospital.

There have been 14 fatalities caused by the by running with bulls in the course of the past 100 years at Pamplona.

The fiesta dates back to the 13th century.