They are from Ukraine, Dnepropetrovsk all aged 19. They are known as Dnepropetrovsk Maniacs. They killed 21 people, they started with small animals and moved to humans. 2 murders were filmed, over 300 photos were presented in court. First victim was killed with metal rods, but it took some time, so they used hammers as well (this is where they fit in) and continued the murder spree killings with a hammer. They said in court that 'they just wanted to have someting to remember when they were old'. All photos and videos were found on their computer, videos were filmed with cellphone (as this video). Later on, one of the suspect quit, and 2 guys continued to murder. They also attended funerals of their victims, and took pics. The videos were shown in court just recently. So these 3 are good candidates for this video. This is a short court vid
http://www.kp.kiev.ua/daily/291008/60468/