Thousands of daredevils fled half-tonne bulls thundering through Pamplona's streets on Saturday in the first bull run of Spain's San Fermin festival, resulting in six injuries.

A fighting bull skewered a 'reckless' Australian thrill-seeker in the leg on Friday after he taunted the beast in Spain's San Fermin fiesta, organisers said.

The half-tonne bull pierced the tourist's