A bomb scare in a San Luis Obispo neighborhood had some residents on edge yesterday. Authorities received a tip that someone on the 600 block of Grand Avenue in San Luis Obispo may have been in possession of bomb making materials. Officers served a search warrant at the residence. According to police, The 31-year-old male occupant was cooperative during the investigation. The search turned up no bomb making materials or explosives. no arrests were made, but an investigation is ongoing.