A shooting Sunday afternoon at the Gilroy Garlic Festival claimed at least three lives, with multiple others injured.

NBC News initially reported that at least 11 people were shot at the festival south of San Jose, and the San Francisco division of the Bureau of Alcohol, Tobacco, Firearms and Explosives reported to the scene after the shots were reported around 5:30 p.m. There were at least three dead among the casualties, as the New York Times reported.

The suspected gunman was shot by authorities and died on the scene. The Chronicle reports via Gilroy Police Chief Scot Smithee that the suspect and "a companion" gained access to the festival grounds via a creek and a hole they cut in a perimeter fence. It remains unclear what the accomplice's role was in the shooting.

A six-year-old boy is also reportedly among the dead.

According to NBC Bay Area, the deceased suspect was "unknown to law enforcement."

The three-day Gilroy Garlic Festival is one of the largest food festivals in the country, and was concluding Sunday evening as the first shots occurred.

A shooter or multiple shooters reportedly began firing during the last musical performance at one of the three stages of the festival Sunday evening. Witness Julissa Contreras tells NBC News that the shooter was a white man in his early to mid-30s firing a rifle that was 'able to shoot three to four shots a second.'"

Another witness, Tony Porrovecchio, tells the Mercury News, "At first I thought some idiot was setting off fireworks, but then we saw him. Once he locked in on us, I ran."

One Twitter user suggested there was more than one shooter, and that one shooter was shot by police.

Multiple videos posted to Twitter showed festival attendees running for cover.

PR team members and chefs at the festival were all OK, according to the Mercury News, and a reunification hotline for people separated from their friends or family was set up at 408-846-0583.

This post has been updated throughout.