DELANO, Calif. (AP) — Authorities say an inmate at a state prison in California’s Central Valley has died after he was attacked by two other men.

Prison officials say 31-year-old Sidney Kang died Thursday after he was attacked in a maximum-security recreational yard at Kern Valley State Prison. He died a short time later.

Authorities say they found two inmate-made weapons and the death is being investigated as a homicide. Kang was sent to prison from Los Angeles County in 2014 to serve 14 years for assault with force likely to produce great bodily injury.