A 39-year-old Irish man suffered injuries in the Spanish city of Pamplona on Friday during the week-long bull-running festival.
Emergency services treated the man for thoracic injuries, which the hospital said were “not severe.”
A 46-year-old from Spain was also seriously injured after being gored in the back of his thigh, which resulted in a head injury as he fell. His injuries were reported as "severe."
Two other men from the US were injured in the run. One (29) was gored in the scrotum and the other (35) suffered a chest wound.
The San Fermín festival usually attracts about 2,000 runners. The 875-metre run lasts just under three minutes as participants dressed in white with red neck scarves run from a dozen bulls.
Fifteen people have died in the run since 1911, with the last fatality occurring in 2009. In 2016, 87 people were injured.
The animals were from cattle breeder Cebada Gago in Andalucia, renowned for rearing dangerous bulls responsible for the most injuries in the history of the week-long San Fermin festival.