Still, some school administrators argue that it is difficult to distinguish innocent pranks and mistakes from more serious threats, and that the policies must be strict to protect students.

然而，一些学校管理层认为，很难分辨哪些是无知的玩笑和过失，哪些是严重的威胁，因此制度一定要严苛才能保护学生。

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Police arrested four people for posting the threats but realised the hacker had compromised the computers of these innocent victims and was abusing their machines remotely via Tor.

BBC: Keyboard