In February 2018, the Southern Poverty Law Center assembled a list of 13 violent incidents between 2014 and 2018 perpetrated by alt-right influenced people, in which 43 people died and 67 people were injured. The perpetrators of these events were all white men between the ages of 17 and 37, with an average age of just over 25 years old (only three of them were over 30). All but one was American, the other was Canadian. Dylann Roof spent much time reading alt-right websites before carrying out the 2015 Charleston church shooting; however, he took greater interest in older white nationalist writers and groups, like the Council of Conservative Citizens and the Northwest Front. In December 2017, the 21-year old William Edward Atchison shot dead two students at Aztec High School in Aztec, New Mexico before killing himself. Atchison's online activity had included posting pro-Hitler and pro-Trump thoughts on alt-right websites like "The Daily Stormer" under such usernames as "Future Mass Shooter" and "Adam Lanza" and joking about school shootings, in particular the Columbine High School massacre.