After a marked police car's rear passenger window was shattered Thursday afternoon, officers in Serra Mesa went looking for a cause and ended up finding shell casings.
Police said the window was shattered just before 2 p.m. near Murphy Canyon Road and Aero Drive. Nobody was injured, according to police.
Check back for updates on this breaking news story.
Get San Diego local news, weather forecasts, sports and lifestyle stories to your inbox. Sign up for NBC San Diego newsletters.