A gunman killed at least three people and injured at least 12 others at the Gilroy Garlic Festival in California on Sunday, law enforcement officials said.

The suspected shooter was shot and killed by police officers within minutes of the first report of gunfire, Gilroy Police Chief Scot Smithee said at a news conference Monday. The gunman was identified as 19-year-old Santino William Legan.

Police are investigating reports that a second individual may have been involved in some way.

The three deceased are a 6-year-old boy, a 13-year-old girl and a man in his 20s, said Smithee, who declined to release the victims names. Local news outlets, as well as CNN and CBS, reported the name of the 6-year-old as Stephen Romero .

The older male victim was later identified as Trevor Irby, a recent graduate of Keuka College in New York. The schools president, Amy Storey, said in a statement Monday that Irby graduated from Keuka in 2017 with a degree in biology.

The Santa Clara County coroners office identified the 13-year-old victim as Keyla Salazar of San Jose, according to local news outlets .

Police initially stated that at least 15 people had been injured but lowered the count to 12 on Monday morning.