It's all over the news at the moment, Eric Pekka, 18, took a gun to school and opened fire on several people. He ended up killing the headmistress and seven students.
CNN reports that Eric had posted videos of him and his guns on youtube for the world to see.
Just to show you, it's not just an American problem.
Finland has an elaborate gun licensing system which requires a permit for every single firearm, and every single person who uses that firearm must be licensed for it. Sadly, that didn't stop Eric.