The Santa Fe High School shooting , in which ten people were killed , strongly resembled the Columbine massacre ; the perpetrator , Dimitrios Pagourtzis , used a pump-action shotgun and homemade explosives , wore similar clothing as Harris and Klebold ( including a black trench coat and combat boots ) and reportedly yelled " Surprise ! " to a victim during the shooting , a possible reference to the library massacre at Columbine . The Kerch Polytechnic College massacre appears to be a copycat crime . The shooter wore a white shirt which said " Hatred " ( in Russian ) , one fingerless glove , planted bombs , and committed suicide with a shotgun in the library
Santa Fe High School shooting
Santa Fe High School shooting
Columbine High School massacre