Overview

• The stabbing occurred around 12:20 p.m. Wednesday inside the Stater Bros on East Mission Road near Bennett Avenue in San Marcos.
• Two men shopping together argued before one allegedly pulled a knife and attacked the other, according to the Sheriff's Office.
• A woman who tried to intervene was injured, the man suffered serious wounds, and both were transported to a hospital.
• Rancho Santa Fe Fire Protection District firefighters who witnessed the attack separated the men, detained the alleged assailant, and provided medical aid until paramedics and deputies arrived.
• A 20-year-old man was arrested on suspicion of attempted murder and assault with a deadly weapon causing great bodily injury, with the investigation continuing.