The deadly goring occurred about 1 AM during festivities at the small village of Pedreguera, where the Red Cross said the heifer gored the 29-year-old man through the thorax and abdomen. He was taken by ambulance to a nearby hospital and pronounced dead an hour later.
The town suspended all bull-related festivities for the day.
At the famed San Fermin festival, the bull run was unusually long today, with one bull left stranded at the starting gate, where he proceeded to charge and strike a couple of runners. Many other participants fell and were stampeded by the head of the pack in the 850-meter race.
The regional government said a dozen others were also taken to city hospitals for trauma care, including a 37-year- old from Barcelona and another 33-year-old Japanese man.
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More than 1,000 people took part in the run, which lasted just over four minutes, about 1 and a half times longer than usual.
Bull runs are a traditional part of summer festivals across Spain. The nine-day San Fermin fiesta became world famous with Ernest Hemingway's 1926 novel "The Sun Also Rises" and attracts thousands of foreign tourists each year.
Ten people, including four Americans, were gored at the San Fermin festival last year. In all, 15 people have died from gorings at the festival since record-keeping began in 1924.