Kerch Polytechnic College massacre
On 17 October 2018, a school shooting and bombing attack occurred in Kerch, Crimea. The perpetrator, Vladislav Roslyakov, who was an 18-year-old student at the college, killed 20 people and wounded 73 others before killing himself.
Source: Wikipedia — Kerch Polytechnic College massacre (CC BY-SA 4.0)