The "San Fermin" began in Pamplona, Spain, AFP reported, quoted by NOVA.
Thousands of people gathered at noon shouting "Long live San Fermin".
The holidays, which have existed since the Middle Ages, are an occasion for concerts, religious processions, fireworks. The main attraction remains the running of the bulls every morning at eight o'clock in the morning. The first release is scheduled for Sunday. Hundreds of people looking for strong emotions run through the streets of Pamplona about 850 m in front of six bulls.
The race ends in the city bullring, during which the six bulls must be killed.
Dozens of injuries and even deaths are registered every year. The last fatality was in 2009, when a 27-year-old Spaniard was gored by a bull. At least 16 participants have died since 1911, when data on what happened on the holidays began to be collected.