[Here’s what we know about the California shooting and Stephen Romero, the 6-year-old killed.]

At least three people were killed and 12 more were injured in a shooting at a garlic festival in Gilroy, Calif., on Sunday, the authorities said.

A suspect carrying an assault-style rifle was fatally shot by the Gilroy police, the city administrator, Gabriel Gonzalez, said in a statement. Late Sunday evening, the police were continuing to search for a possible accomplice in Gilroy, which is about 30 miles southeast of San Jose.

[Related: El Paso Walmart shooting: At least 18 reported dead in Texas massacre.]

“We believe based on witness statements that there was a second individual involved in some way, we just don’t know in what way,” Chief Scot Smithee of the Police Department said at a news conference.