Police fatally shoot man who was lighting fireworks in his backyard in Downey

Police fatally shot a man who was lighting fireworks in his backyard in Downey on Saturday. 

They were called to the 7100 block of Stewart and Gray Road, near Pernell Avenue, at around 6:15 p.m. for reports of a disturbance in the area, according to a statement from the Downey Police Department. 

"Officers arrived on scene and during their investigation, an officer-involved shooting occurred," the statement said. "A male subject was shot and died from his injuries."

Witnesses claim that the incident began when a neighbor, who allegedly has mental health issues, was lighting fireworks in his backyard and got into an argument with another neighbor. 

On Monday, authorities identified the victim as Alberto Arenas, 29. 

Exact circumstances leading up to the shooting remain unclear. 

The California Department of Justice will be investigating the incident as the man was unarmed when he was killed. 

No other injuries were reported.