On January 17, 1989, the Stockton Police Department received a threat against Cleveland Elementary School from an unknown person. Later that day, Patrick Purdy, who was later found to be mentally ill, opened fire on the school's playground with a semi-automatic rifle, killing five children, all Cambodian or Vietnamese refugees, and wounding 29 others, and a teacher, before taking his own life. The Cleveland Elementary School shooting received national news coverage and is sometimes referred to as the Cleveland School massacre.