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Serial killer 'NO1KNOWS' managed to elude the police for years. In fact they didn't even know he existed until, by chance, his video and audio recordings were found. By examining the recordings police were able to solve a number of murders ...

连环杀手“NO1KNOWS”多年来一直设法躲避警方。事实上，他们甚至不知道他的存在，直到偶然发现了他的视频和录音。通过检查录音，警方能够解决世界各地的一些谋杀案-尽管录音中...