The suspects of the shooting at a food festival in Gilroy, northern California, have been identified as 19-year-old Santino William Riggan, according to media reports including CBS News.

At the scene of the "Gilroy Garlic Festival" the night before, Rigan fired an assault rifle, killing three people and counting 15 injured.

He was shot dead by a police officer in the field.

Riggan's house was in a dead end street less than two miles from the festival site.

Police searched the house and vehicle the day before and collected several pieces of evidence in their bags.

According to his neighbors, he lived with his parents and two or three brothers and sisters in this house for nearly 20 years.

"I am shocked that this happened," said neighbor Ilia Seturina, "they are a very good family."

In the Instagram account under the name of Riggan, there was a posting of a picture of the Garlic Festival along with the words "Waste on the Amaragi Festival Time. Come to the expensive one," the local daily San Francisco Chronicle reported.

He also posted a few minutes later in a letter to the Instagram asking him to read a book called "Today is a fire hazard" and a book called "The Power is Right or the Survival of the Red."

This book, published in 1890, contains advocacy for self-love, anarchism, and morality.

Among the victims killed in the shootings of Ragan were six-year-old boy Stephen Romero.

The boy, who celebrated his birthday in Legoland, California last month, went to the festival with his mother and grandmother and was devastated.