Revelers celebrate during the 'Chupinazo', the official opening of the 2012 San Fermin fiestas, Friday in Pamplona, Spain. Ivan Aguinaga) / AP

A youth is attended to by revelers after he fell to the ground after jumping from a fountain during the 'Chupinazo', the official opening of the 2012 San Fermin fiestas Friday. The condition of the youth is not known. Ivan Aguinaga) / AP

A reveler jumps from a fountain during the 'Chupinazo' on Friday. Ivan Aguinaga / AP

Revelers are sprayed with water after the 'Chupinazo', the official opening of the 2012 San Fermin fiestas on Friday. Daniel Ochoa de Olza / AP

Reveler in Ayuntamiento square in Pamplona Friday celebrate the start of Spain's most famous bull-running festival with the annual launch of the "chupinazo" rocket. Alvaro Barrientos / AP

Revelers hold up traditional red neckties during the 'Chupinazo.' Daniel Ochoa de Olza / AP

Revelers have a lunch on the street, in Pamplona, northern Spain, Friday, to celebrate the start of Spain's most famous bull-running festival with the annual launch of the "chupinazo" rocket. Alvaro Barrientos / AP

Revelers in Ayuntamiento square celebrate the start of Spain's most famous bull-running festival with the annual launch of the "chupinazo" rocket. Alvaro Barrientos / AP

Revelers enjoys water throwing from a balcony during the 'Chupinazo.' Alvaro Barrientos / AP

Revelers run with Dolores Aguirre Yabarra ranch fighting bulls during the running of the bulls of the San Fermin festival, in Pamplona Spain, Saturday. Ivan Aguinaga / AP

Revelers run with Dolores Aguirre Yabarra ranch fighting bulls during the running of the bulls of the San Fermin festival, in Pamplona Spain, Saturday. Ivan Aguinaga / AP

Revelers of ''Pena Voladora'', enjoy the morning dancing at the end of the running of the bulls Saturday. Alvaro Barrientos / AP