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© 2020 Rodoula Makri | Panos Karaivazoglou | Alexandros Kyritsis | Michael Skitsas | Nikolaos Koutras | Javier Valera | Jose Manuel Sanchez
Nowadays, the types of threats against Critical Infrastructures are becoming more sophisticated imposing the use of equally modern detection measures. The involved aspects are too important when considering both direct physical threats and physical threats that enable malicious impact to the cyber domain as well. The Chapter begins with an overview of the current situation in Critical Infrastructures in terms of detecting physical threats, attacks or hazards and continues by introducing modern detecting techniques covering a wider range of threats. These vary from systems with sensors for airborne threats along with audio and visual analytics up to using the wireless networks themselves as sensing systems by exploiting their networking features.