This website uses cookies so that we can provide you with the best user experience possible. Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful.
In the aftermath of the killings, prosecutors presented evidence that the attack had been premeditated. The gunman researched past mass killings, and posted online comments in which he said he would show "no mercy". In one video, taken days before the shooting, the gunman said he planned to be the "next school shooter" of the year and that his goal was to murder at least 20 people.