"Security Audit" Helps Dispel Workplace Safety and Risk
Employers, too, are facing the same concerns, and are implementing various measures to allay employeee fears. One of these is called a "Security Audit," in which experts trained in looking for mishaps conduct a complete inspection of the premises and surroundings in order to identify the potential for violence.
Based on the audit, it is recommended that the company implement procedures to prevent the occurrence of violence, and if the company is proactive in its planning, design plans to respond and contain the situation.
A good place to start for information on this topic is the Center for Disease Control and Prevention's National Institute for Occupational Safety and Health  Workplace Violence homepage.