Each questore has operational control of the provincial police headquarters, which has jurisdiction in the field of public order, security, and criminal and intelligence matters. There are also Polizia di Stato officials at the local level in charge of detached police stations. Other relevant specialist police units are the traffic police, which patrol Italy's roads and highways; the railway police, which ensure the security of travelers and their belongings on Italy's railway system, the security of railway stations, and control of dangerous goods transported by rail; the immigration and border police, which are responsible for the entry and stay of foreign nationals and immigrants in Italy, as well as the prevention and control of illegal immigrants; and the postal and communications police, which seek to prevent and tackle the illegal use of communication technologies (for example, computer hackers and computer viruses). The police air service and the nautical squads perform services ranging from mountain or sea rescues to contributing to the fight against illegal immigration by patrolling the national coasts and other points of entry. Warning and coordination The Polizia di Stato includes various specialist units that may play a role in combating terrorism and protecting different aspects of Italian homeland security. The anti-terrorism police, at both the central and provincial level, have primary responsibility for investigations aimed at preventing and fighting terrorism, including the collection and analysis of information related to terrorist offenses. Incident mitigation There is also an Inter-ministerial Committee for Civil Defense. Also within the Prime Minister's office is the Department of Civil Protection, which is responsible at the national level for prevention, preparedness, and coordination of responses to both natural and man-made disasters. This Department coordinates Italy's "National Service" for civil protection, which consists of central, regional, provincial, and local (or municipal) state administrations, public agencies, and voluntary organizations. This national service system operates on the principle of subsidiarity. In the event of an emergency, primary responsibility for managing the response falls on the local mayor. If the resources at the disposal of the mayor are insufficient, support may be drawn from provincial, regional, or national assets. Military assets can also be used to assist with a large-scale emergency, including those with a CBRN dimension. Any military forces deployed, however, would be under the command of the civil authorities. Italy also has a military corps, or Carabinieri, that carries out police duties among its civilian population.