A man has been gored and four others have been injured on the first day of the running of the bulls in Pamplona.
During the first run on Saturday of the nine-day long San Fermin festival, five people were wounded as they were chased by 600kg (1,322lbs) bulls through the streets of the northern Spanish city, the Red Cross said.
A 20-year-old Canadian man is being treated for “traumatic injuries”, officials from the Navarra regional government said.
The other men are Spanish and include a 38-year-old who was gored and a 40-year-old who sustained “serious traumatic injuries”.
They have all been admitted to hospital, officials said.
Many other runners were trampled early on, and some were injured as the 12 beasts entered Pamplona’s bullring after completing the 848m (0.53-mile) dash from the corral in two minutes and 37 seconds.
No further information was available about the extent of their injuries.
Overnight showers made the streets slippery and some bulls chose other paths as they became separated from the herd.
The festival kicked off on Friday at midday with fireworks ahead of the first running of the bulls on Saturday morning.
Inigo Plaza, a 29-year-old automobile worker who took part in the run, said: “The important thing is to finish in one piece and to be here again tomorrow.
“To have an animal weighing 600 kilos behind you and with all these people in the streets it’s an undescribable feeling of adrenaline and excitement.”
Raul Plaza, 37, who has run more than 130 times at San Fermin, added: “It’s taking a lot of risks for nothing.”
The annual event, which dates back more than 700 years, attracts more than a million people.
Hundreds of people participate in the running of the bulls every morning for eight days of the festival.
Since 1910, 16 runners have died – the last one in 2009.
Last year more than 17,000 people took part, with 64 injured, seven of them gored.
The start of San Fermin was overshadowed by the release on bail just before the festival of five men, who called themselves “The Pack”.
They filmed themselves having sex with an 18-year-old woman during 2016’s festival.
Thousands of Spaniards protested in April after a court sentenced them for “sexual abuse” instead of the more serious offence of “sexual assault” – which includes rape.
The festival attracts a large number of foreign visitors every year after author Ernest Hemingway described it in his novel, The Sun Also Rises.
Although he never ran with the bulls Hemingway visited many times between 1923 and 1959.