Sept. 24 (UPI) -- San Diego police fatally shot and killed a man on Tuesday who was reportedly found armed outside of an elementary school.

The California Attorney General's Office has since launched an investigation into the incident under a police accountability law. But the involvement of the attorney general raises additional questions about the incident.

Police received a call at around 6:43 a.m. PDT that a man was sitting on the campus of Fay Elementary School who had a "gun next to him" and was holding a knife, according to department spokesperson Lt. Travis Easter, who described the incident in two brief videos posted to Facebook.

Officers contacted the man and used de-escalation techniques that included firing less-lethal bean bag rounds and using and an officer K-9, Easter told KNSD.

However, police opened fire on the man after their efforts were unsuccessful. Officers performed life-saving measures on the wounded man, but he died at the scene. No officers were injured.