Four people have been gored during the sixth bull run of Spain's San Fermin festival, causing panic in the packed streets of Pamplona.

Tension soared when one bull charged a young man and pushed him around on the ground with its horns for almost 30 seconds as fellow runners tried to pull the bull away by its tail.

The helpers eventually dragged the victim to safety by his feet.

Navarra Hospital chief Javier Sesma said bulls injured four people on Friday, while three others were taken to city hospitals for other injuries.

The gorings were the first of this year's runs during which crowds test their bravery by dashing with six fighting bulls to the bullring.

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