Best Gore member @kulu321 has the backinfo:
The video shows two armed police officers in Papua New Guinea hitting a naked thief with sticks, kicking him in the head, and dragging him along the rocks. In addition to pointing an M-16 to his head, at one point one of the officers grabs a slingshot and fires a stone at him.
The boy was allegedly part of a theft gang. Ironically, when they were caught, the rest of his mates escaped and abandoned him.
Between piece of shit thieves and ACAB, there are no winners here. Many thanks for the video, @kulu321: