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A California mortuary became an unexpected terror zone Thursday night when gunfire broke out, injuring five people. Police say they found three injured people when they responded to 911 calls about a shooting at the Chapel of the Chimes in Hayward, the San Francisco Chronicle reports. Police say they found a fourth person with gunshot wounds while investigating the shooting, while a fifth took themselves to the hospital. Investigators believe the shooting happened in the cemetery portion of the combination funeral home-cemetery, though it's not clear whether there was a service in progress at the time. One witness tells CBS News that "the funeral director told us to stay inside because there was a shooting, something related to gang activity, and so we were on lockdown for at least an hour." (Read more California stories.)