A San Diego police officer driving by, saw smoke coming from an apartment at 12700 Rancho Peñasquitos Boulevard, early Sunday morning. Stream San Diego News for free, 24/7, wherever you are with NBC 7. Because of a smoke alarm that went off in the apartment, they all got out of the burning building without being hurt. This is the time to do that battery safety check, and this fire is a great example that smoke detectors do save lives. Battalion Chief Chris Babler, San Diego Fire DepartmentAn investigator said there were fully charged batteries in the smoke alarm.