The bulls from the Torrestrella ranch took to the streets of this northern Spanish city Thursday in a fast and dangerous run that featured some hairy moments but did not leave anyone gored.

Four people were hospitalized during the fifth running of the bulls at the world-famous San Fermin festival, including American Peter Milligan, a 42-year-old from New Jersey who suffered a broken ankle when he was shoved to the ground by another runner.

Milligan, whose brother was gored in the calf last year, told Efe that he was receiving excellent medical care in Pamplona, adding that he felt fortunate he was not gored but was sad that he would not be able to participate in any of the remaining three bull runs.

The Torrestrella bulls, from the southwestern city of Cadiz, are known as among the most aggressive, although on this occasion they stayed in a loose herd and did not charge at any of the runners during the two minutes and 46 seconds it took them to reach the Pamplona bullring.

The San Fermin festival, which started on Saturday and ends on July 14, is known around the world for its running of the bulls and street revelry.

Hundreds of events have been scheduled for this year's edition of the world-renowned street party in Pamplona, a normally quiet town that welcomes hundreds of thousands of Spanish and international visitors annually.

The festival, begun about 400 years ago, was popularized by Ernest Hemingway in his 1926 novel "The Sun Also Rises."

The run through the medieval streets of Pamplona's historic center, usually lasting four minutes, is especially dangerous because some runners take part in the event after all-night drinking binges.

This makes runners reckless and more likely to get too close to the bulls, which weigh in excess of 500 kilos (1,100 pounds).

The running of the bulls is monitored by experts who control the route and try to prevent accidents, but, inevitably, runners fall, suffer cuts and bruises, and are even gored by the animals.

Four people were gored at the 2012 San Fermin festival, while 41 were transported to hospitals and 388 others were treated at the scene by paramedics for a variety of injuries.

Thirteen people have suffered bumps and bruises and fractures in this year's first five running of the bulls, most of whom have been released from the hospital.

No has yet been gored in this edition of the festival. EFE