Revelers are chased by bulls during the Running of the Bulls of the San Fermin festival, in Pamplona, Spain, July 7, 2014.

A reveler is charged by a bull as thousands run with Torrestrella's fighting bulls along the Calle Estafeta in the second day of the San Fermin Running of The Bulls festival, July 7, 2014 in Pamplona, Spain.

Revelers wait to run with Torrestrella's fighting bulls along the Calle Estafeta during the second day of the San Fermin Running of The Bulls festival, July 7, 2014 in Pamplona, Spain.

Revelers run in front of ''Torrestrella'' fighting bulls on Estafeta corner during the running of the bulls at the San Fermin festival, in Pamplona, Spain, July 7, 2014.

Police in line control the runners before the Running of the Bulls at the San Fermin festival, in Pamplona, Spain, July 7, 2014.

Revelers hold up traditional red neckties during the launch of the "Chupinazo" rocket to celebrate the official opening of the 2014 San Fermin fiestas, in Pamplona, Spain, July 6, 2014.

A reveler is lifted above the crowd during the launch of the "Chupinazo" rocket to celebrate the official opening of the 2014 San Fermin fiestas, in Pamplona, Spain, July 6, 2014.

People cheer after hearing the midday "Chupinazo" rocket announcing the start of the San Fermin festival in Pamplona, July 6, 2014. Tens of thousands of expectant party-goers with red scarves squeeze into the town hall to kick off 204 hours of music, dancing, drinking and bullfighting.

Spanish rejoneador (bullfighter on horseback) Sergio Galan performs at the Plaza de Toros on the first day of the San Fermin festival in Pamplona, July 6, 2014.

People cheer after hearing the midday "Chupinazo" rocket announcing the start of the San Fermin festival in Pamplona, July 6, 2014.