While the term can include acts committed in the air, on land (especially across national borders or in connection with taking over and robbing a car or train), or in other major bodies of water or on a shore, in cyberspace, as well as the fictional possibility of space piracy, it generally refers to maritime piracy. It does not normally include crimes committed against people traveling on the same vessel as the perpetrator (e.g. one passenger stealing from others on the same vessel). Piracy or pirating is the name of a specific crime under customary international law and also the name of a number of crimes under the municipal law of a number of states. In the early 21st century, seaborne piracy against transport vessels remains a significant issue (with estimated worldwide losses of US$16 billion per year in 2004), particularly in the waters between the Red Sea and Indian Ocean, off the Somali coast, and also in the Strait of Malacca and Singapore.