This infographic from the National Center for Victims of Crimes presents data on workplace violence in the US: "Workplace violence is violence or the threat of violence toward someone working or on duty. While workplace violence ranges from physical assault to robbery to homicide, the most common form is simple assault. Overall, workplace violence has declined in recent years, yet workplace homicides of government employees have increased. Workers in certain occupations--nurses, utility workers, taxi drivers, letter carriers, and others who work alone or at night--are particularly vulnerable to workplace violence. Unlike other forms of violence, strangers commit the greatest proportion of these crimes."
Office of Justice, Office for Victims of Crime: https://ovc.ncjrs.gov/