“Terrorism constitutes the illegitimate use of force to achieve a political objective when innocent people are targeted.” (Walter Laqueur)

“Terrorism is defined here as the recurrent use or threatened use of politically motivated and clandestinely organised violence, by a group whose aim is to influence a psychological target in order to make it behave in a way which the group desires.” (C. J. M. Drake)

“The unlawful use of force or violence against persons or property to intimidate or coerce a government, the civilian population, or any segment thereof, in furtherance of political or social objectives." (FBI)