Suicide attack
Suicide attacks include both Suicide terrorism—terrorism often defined as any action "intended to cause death or serious bodily harm to civilians or non-combatants" for the purpose of intimidation—and suicide attacks not targeting non-combatants. An alternative definition is provided by Jason Burke, a journalist who has lived among Islamic militants, and suggests that most define terrorism as 'the use or threat of serious violence' to advance some kind of 'cause', stressing that terrorism is a tactic. Academic Fred Halliday, has written that assigning the descriptor of 'terrorist' or 'terrorism' to the actions of a group is a tactic used by states to deny 'legitimacy' and 'rights to protest and rebel'.
Unrestricted Warfare
Another instance of threats to nations within the scope of the concept of "unrestricted warfare" is terrorism. Terrorism is used by a group to gain satisfaction for certain demands. Even if these demands are not satisfied, a terrorist attack can have vastly disproportionate effects on national welfare. One only has to look at the economic crisis that followed the terrorist attacks against the United States, or the extensive security measures put in place after those same attacks. Terrorism erodes a nation's sense of security and well being, even if the direct effects of the attacks only concern a minute percentage of the population.