A report of an assault in Grover Beach on Thursday led to officers detaining nearly a dozen people at a home in the 1600 block of Mentone Avenue.
Officers responded to the report at about 10 a.m. and found 10 people in the home, including two women fighting, Police Chief John Peters.
Peters said when officers intervened, a Grover Beach man began arguing with them and a brief struggle ensued. The man was arrested on suspicion of misdemeanor obstructing an officer.
One of the women was cited for outstanding misdemeanor warrants.
Paul Eugene Peterson, 24, was arrested on suspicion of felony criminal threats after allegedly approaching officers with a knife in his belt and making threatening statements.
The Tribune does not identify people arrested for only misdemeanors.
Officers found illegal electrical modification throughout the house, Peters said, and a building inspector red-tagged the home, meaning no one can stay in it overnight until multiple code violations are corrected.
Peterson remained in San Luis Obispo County Jail in lieu of $50,000 bail on Thursday.