A terrorist attack is a sudden,unpredictable and unplanned action aimed to disrupt the infrastructure of the place where it occurs and causing large numbers of victims.Thus,the role of the public authorities is to rescue the victims as quickly as possible after securing the area and re-establishing the access routes.These operations are codified in action plans which are applied to the extent of structures and personnel not affected by the events and available to deal with the consequences of the concomitant or successive events.