GILROY, Calif. — The smell of barbecue was wafting through the air, a local rock band was playing its last song and parents were collecting their children at the end of the annual garlic festival in Gilroy, Calif., on Sunday when a gunman opened fire, killing three people.

Stephen Romero, a 6-year-old boy from San Jose who loved Legos and Batman, had been playing near a bounce house with his mother and grandmother before he was killed. A 13-year-old girl and a man in his 20s were the other victims, police said Monday.

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