Tier A - Overview

San Ysidro McDonald's Massacre occurred in San Diego, California, USA on June 18, 1984. This entry is included for awareness and remembrance, and to support prevention-forward learning in business and related settings. Where available, key facts below summarize the incident and highlight lessons for early reporting, protective action, and system-level readiness.

Victims: No information available.

Tier B - Prevention insights

- Reinforce workplace reporting channels and HR/security coordination for concerning behaviors. - Normalize early reporting: make it easy to share concerns (anonymous options, clear points of contact). - Track patterns, not single incidents: repeated leakage, fixation, grievances, or boundary testing deserve attention. - Use multidisciplinary review: ensure security, HR/student affairs, mental health, and leadership share context. - Practice communication: define who sends alerts, what language is used, and what 'protective action' means on-site. - After-action learning: review policies, access controls, and response timelines after drills and real incidents.