Social media video grab of people running away as an active shooter was reported at the Gilroy Garlic Festival on Sunday. Reuters
Among the victims was a six-year-old boy, his grandmother told US media, while at least 15 others were injured.
Officers confronted and shot dead the suspect "in less than a minute," said Scot Smithee, police chief of the city of Gilroy, 48 kilometres southeast of San Jose.
Police officers escort people from Christmas Hill Park following a deadly shooting during the Gilroy Garlic Festival. AP
A search for a possible second suspect was ongoing, Smithee said, adding that the site of the three-day Gilroy Garlic Festival was "still an active crime scene."
"We believe based on witness statements that there was a second individual involved in some way, we just don't know in what way," he told journalists.
The grandmother of six-year-old Stephen Romero said he was shot while attending the event with his mother and other grandmother.
Describing her grandson as "always kind, happy and... playful," Maribel Romero told ABC7 News Stephen had died by the time she arrived at hospital.
Footage showed people fleeing in terror as shots rang out at one of the largest food festivals in the country.
A witness named Julissa Contreras told NBC a white man in his 30s armed with a rifle opened fire indiscriminately.
"I could see him shooting in just every direction. He wasn't aiming at anyone specifically. It was just left to right, right to left," Contreras said, according to NBC.
People wait for relatives at a reunification center at Gavilan College following a shooting at the Gilroy Garlic Festival. AP
"He definitely was prepared for what he was doing," she said.
Smithee said the suspect appeared to have entered the 50-acre festival site via a creek, using cutting equipment to breach the event's perimeter.
Metal detectors and bag searches were in place as part of "very tight security" at the festival, he said.
No motive was known but the suspect's shooting appeared "somewhat random," Smithee added. The suspect used "some sort of a rifle," he said.
US President Donald Trump earlier tweeted that law enforcement officers were at "the scene of shootings" in Gilroy, urging members of the public to "Be careful and safe!"
Festival director Brian Bowe told reporters it was "horribly upsetting" that the attack happened on the third and final day of this year's event in Gilroy, which he described as an "amazing... a tightly-knit community."
"Our 4,000-plus local volunteers work so hard every year and to see this event end this way is just one of the most tragic and sad things that I've ever had to see," Bowe said.
"We feel so upset for those that are impacted — friends, families, neighbors. It's just a horrible thing to experience."
California governor Gavin Newsom said the incident was "nothing short of horrific."
"Tonight, (California) stands with the Gilroy community. My office is monitoring the situation closely," he tweeted.
"Grateful for the law enforcement's efforts and their continued work as this situation develops."
This screen grab taken from a handout video footage shows people running away from gunshots. AFP
The Mercury News reported that the shooting took place as the festival was winding down.
Stagehand Shawn Viaggi hit the ground after hearing "loud pops," it said.
"I called out, 'It's a real gun, let's get out of here,' and we hid under the stage," Viaggi said, according to the newspaper.
The Gilroy Garlic Festival features live entertainment including bands and cooking competitions as well as food and drink, and draws nearly 100,000 people over three days each year, according to organisers.
The family event is a major focal point for the small city of around 50,000.
Thirteen-year-old Evenny Reyes told the Mercury News that "we were just leaving and we saw a guy with a bandana wrapped around his leg because he got shot. And there were people on the ground, crying."
"There was a little kid hurt on the ground. People were throwing tables and cutting fences to get out," said Reyes.
"Grateful to first responders who are on the scene in Gilroy and keeping those injured by such senseless violence in my thoughts," Senator Kamala Harris, who is running for the 2020 Democratic presidential nomination, wrote on Twitter.
shootings are a frequent occurrence in the United States, but despite the scale of the gun violence problem in the country, efforts to address it legislatively have long been largely deadlocked at the federal level.
Police and the suspect exchanged fire, according to the Los Angeles Times. "The situation has been stabilized and there is no threat to the public," the Orange Police Department said in a post to their Facebook page.
Others were taken to Community Regional Medical Center in critical condition, and some are in critical but stable condition, the TV stations reported.
Officials didn’t know if the family members belonged to the church, which sits on a mostly residential block near a commercial area east of downtown Sacramento. The shooter’s name wasn’t immediately released, but officials said he was 39 years old.
Gun violence in the United States has been under scrutiny after last month's massacres at an elementary school in Uvalde, Texas — which left 19 children and two teachers dead — and a supermarket in Buffalo, New York — which killed 10 people.
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