Threat: If you feel threatened you can always call the police via 110 for free.
Threat on campus: If you feel thraetened at the university, you can either call the police and/or the Threat Management Unit for assistance at any time by dialing 0271 740 2600.
Persistent/repetitive threat or similar: In this case, you can contact the victim protection unit of the police (Ms. Otto). The best way to make contact is via the threat management department (-2600).