At least five people have been shot, according to a hospital spokesperson. Their condition is not yet known.
Santa Clara Valley Medical Center spokeswoman Joy Alexiou said two people who suffered gun wounds had been taken to hospital and that three more victims were expected to arrive shortly.
Local news NBC Bay Area reported that ambulance crews were told 11 people were “down” after gunshots were heard around 5.30pm local time.
Gilroy police released a statement, saying: “The hearts of Gilroy PD and entire community go out to the victims of today’s shooting at the Garlic Festival.
“The scene is still active. If you are looking for a loved one, please go to the reunification center at Gavilan College at parking lot B.”
The San Francisco Division of the Bureau of Alcohol, Tobacco, Firearms and Explosives are responding to the scene.
A number of videos posted to social media showed people running away from the event. Gunshots could be heard in the background of some of the clips.
In one of the videos a woman can be heard asking: “Who would shoot up a garlic festival?”.
A 13-year-old girl told local news San Jose Mercury News she had initially thought the noise had been fireworks, but saw a man that had a bandanna tied around his leg wound.
One of the largest food festivals in the US, the Gilroy Garlic Festival is an annual three-day event south of San Jose at the outdoor Christmas Hill Park. It was founded in 1979 and is situated around 30 miles south of San Jose.
The event’s website says weapons of any kind are prohibited and that 4,000 people work and volunteer at the festival.
More follows…