Terrorism is, in the broadest sense, the unlawful use of intentional violence to achieve political aims, especially against civilians. It is used in this regard primarily to refer to violence during peacetime or in the context of war against non-combatants (mostly civilians and neutral military personnel). The terms "terrorist" and "terrorism" originated during the French Revolution of the late 18th century but became widely used internationally and gained worldwide attention in the 1970s during the conflicts of Northern Ireland, the Basque Country, and the Israeli–Palestinian conflict. The increased use of suicide attacks from the 1980s onwards was typified by the September 11 attacks in New York City, Arlington and Pennsylvania in 2001.