A Columbia University study found that 100% of the mass killings were initiated by males of whom 66.7% were White

 A Columbia University study found that 100% of the mass killings were initiated by males (mean age 28) of whom 66.7% were Caucasian who viewed themselves as engaging in some form of “final act.” 

To conduct their study, the researchers analyzed data from the Columbia Mass Murder Database (CMMD), developed by the COPE team to gain much-needed insight into the relationship between serious mental illness and mass shootings. Creating the CMMD involved extensive review of 14,785 murders publicly described in English in print or online, occurring worldwide between 1900 and 2019.  

Read the publishing Research Findings