Who are these people?

* Maila Irmeli Björklund, 15 years old at time of death. Stabbed and bludgeoned

* Anja Tuulikki Mäki, 15 years old at time of death. Stabbed and bludgeoned

* Seppo Antero Boisman, 18 years old at time of death. Stabbed and bludgeoned

* Nils Wilhelm Gustafsson, 18 years old at the time - the survivor - Concussion, fractures in the jaw and facial bones and bruises on the face.