 The issue of foreign terrorist fighters is of concern to all Interpol member countries, especially to those monitoring the movement of their nationals that have traveled to various conflict zones. While much of the focus on security has been on airports and air travel, we have noticed that some of these foreign terrorist fighters are traveling by commercial maritime vessels into various Mediterranean sea ports. In response to this threat, Interpol initiated Operation Neptune, an intelligence-led operation targeting a movement of foreign terrorist fighters utilizing the maritime route across the Mediterranean Sea, involving six countries, Morocco, Algeria and Tunisia, Spain, France and Italy. During the operation, Interpol deployed officers to selected ports to assist local authorities in conducting systematic advanced passenger screening. By searching in real time, the ships manifest against Interpol's databases and other national regional databases. Of course, our principal objective was to locate terrorists, but through this initiative, we also looked to foster regional and national interagency cooperation and to strengthen the exchange of information between agencies involved in border security and safety in the Mediterranean waters.