Terrorism and International Law

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  • InternationalandComparativeLawQuarterlyhttp://journals.cambridge.org/ILQ












    On 11 September 2001 commercial passenger jets hijacked by suicidecommandos were flown into the Twin Towers of the World Trade Center inNew York. As the Towers imploded and collapsed, the death of several thou-sand people was witnessed live on television screens throughout the world.Those attacks, together with that on the Pentagon and the failed attempt thatended in Pennsylvania, aroused profound indignation and led to immediatereactions against the perpetrators or their protectors and sponsors, and moregenerally against international terrorism.

    Some commentators felt that international law was left dumbfounded, inca-pable of giving a name to these events, which did not seem to fall under anyof its established categories. For those observers, the law had been seriouslychallenged by the impact of 11 September, and a whole new law was emerg-ing. But, as time went by, others observed that it was in fact possible to findsolutions to the issues raised within the existing law, and that legal responsessimply had to be fine-tuned to address this new situation.

    So what conclusions can be drawn from this? Has international lawsucceeded in finding a generally accepted definition of terrorism? Has it set upagreed measures for the prevention and punishment of terrorist acts? Andfinally, does it provide adequate mechanisms for action against States whichaid and abet terrorism? These are the three questions that I shall address here.

    What is terrorism? How can it be characterized in law, and in particularinternational law?

    The notion of terrorism is obviously related to that of terror. In the mostgeneral sense, that term denotes an extreme fear, usually stemming from avaguely perceived, relatively unknown and largely unforeseeable threat. Inthis sense, terror can be caused by human action but also by natural disasterssuch as volcanic eruptions or earthquakes.

    However, the word terror took on a new meaning at the end of the eigh-teenth century during the French Revolution, when, threatened with a foreigninvasion and civil unrest, the Convention proclaimed the Terror in 1793 andunder that head adopted a series of exceptional measures that were to be imple-mented by the Committee of Public Safety under the authority of Robespierre.In 1794 he was overthrown and then executed. But in condemning him the

    * Judge and former President of the International Court of Justice. This is the text of the 2003Grotius Lecture delivered by HE Gilbert Guillaume at the British Institute of International andComparative Law on 13 November 2003.

    [ICLQ vol 53, July 2004 pp 537548]

  • Convention could not claim he was responsible for the Terror that they them-selves had proclaimed. So they accused him of terrorism, a term which fromthe outset thus referred to the use of terror by the State.

    The term was to take on a new meaning in the late nineteenth century. Theattacks perpetrated in Russia by the Nihilists, then throughout Europe by theAnarchists, were to be described as terrorist. As a result, terrorism came torefer not only to terror used by the State but also to that used against the State.

    The two meanings remained commonplace throughout the first half of thetwentieth century. In 1920 Trotsky wrote an apologia of terrorism1 in whichhe justified State terror when used in the name of the dictatorship of the prole-tariat. However, in the following decade, after the assassination in 1934 ofKing Alexander of Yugoslavia, the League of Nations drew up two stillbornconventions, one of which provided for the prevention and suppression of thattype of terrorist act.

    State terror has unfortunately thrived over the past half century. But therehas also been a considerable rise in anti-State terrorism, which is the type ofaction now usually referred to by the term terrorism in everyday parlance.

    The reason why such terrorism has become widespread in the world todayis because it provides a highly advantageous method of combat, with its poten-tial for significant results at limited human and financial cost. Technicalprogress has played an essential role in this regard. Nitroglycerine or mercurybombs have been replaced by remote-controlled devices that are increasinglydifficult to detect. The growing fragility of our civilization has increased thenumber of sensitive targets as it has the means of escape. Lastly, the develop-ment of mass media has enabled terrorists to put across their message moreeffectively and, through the press and television, to accentuate the terror theyseek to spread. Impassioned feelings, or indeed fanaticism, have furtherincreased the risks.

    Faced with this situation, governments have not simply remained on thesidelines. Since 1963, various decisions and conventions have been adoptedwithin the United Nations, specialized agencies and regional organizations,particularly within Europe.

    For decades the authors of these instruments for the prevention andsuppression of offences including certain acts of terrorism have, however,refrained from using or defining the term terrorism itself. They havepreferred to focus on the prosecution or extradition of perpetrators of certaindesignated acts such as the hijacking of aircraft, acts of violence againstaircraft, airports, ships and oil platforms, attacks on diplomats or hostage-taking.2 This prudence indeed explains the success of the various conventions

    538 International and Comparative Law Quarterly

    1 Leon Trotsky In Defence of Terrorism (London Allen & Unwin 1935); see also Dfense duterrorisme Nouvelle Revue Critique 1935, in particular at 23 and 76.

    2 See the Hague Convention for the Suppression of Unlawful Seizure of Aircraft,16 Dec 1970; Montreal Convention for the Suppression of Unlawful Acts against the Safety ofCivil Aviation, 23 Sept 1971; Convention on the Prevention and Punishment of Crimes against

  • thus concluded under the auspices of the ICAO, the IMO or the UnitedNations, now binding on the vast majority of States. (The Hague Conventionof 1970 for the Suppression of the Unlawful Seizure of Aircraft has, for exam-ple, been ratified by some 180 countries.)

    The discussions that took place at the time, in both Strasbourg and NewYork, illustrated the difficulty of finding a unanimously accepted definition ofterrorism. The Ad Hoc Committee on International Terrorism set up by theUnited Nations General Assembly attempted to achieve this between 1972 and1979. But it was unable to succeed because, during the debates, the membersof the Group of 77 repeatedly emphasized the legitimacy of actions bynational liberation movements and demanded that such actions should in noway be confused with terrorism.3 It appeared then and later that, quite often,according to a commonplace of our times, one persons terrorist is anotherpersons freedom fighter.

    The wisdom of the draftsmen of those early conventions which sought tocombat terrorism without actually naming it as such, was however short-lived.In the 1990s, the term terrorism reappeared under the pressure of politicians,the media and NGOs, first of all in press releases, unilateral declarations orother so-called soft law texts, then in international conventions. In 1977, theCouncil of Europe had already drawn up a convention on the suppression ofterrorism, but had omitted to provide any definition of the term.4 Twenty yearslater a convention was drawn up by the United Nations for the suppression ofterrorist bombings, but came no closer to defining terrorism.5 It was only in1999 that a convention signed in New York for the suppression of the financ-ing of terrorism made a first attempt at a definition, the result being unhappilyinconclusive.6 It was somewhat paradoxicalat least at first glancethat theinternational community was seeking to suppress terrorism but could notreally pinpoint its meaning.

    The 11 September events did not herald any change of direction in thisrespect. The Security Council, in its Resolution 1368 of 12 September 2001,

    Terrorism and International Law 539

    Internationally Protected Persons, including Diplomatic Agents, New York, 14 Dec 1973;International Convention against the Taking of Hostages, New York, 17 Dec 1979; Protocol forthe Suppression of Unlawful Acts of Violence at Airports serving International Civil Aviation,supplementary to the Montreal Convention for the Suppression of Unlawful acts against theSafety of Civil Aviation, 24 Feb 1988; Rome Convention for the Suppression of Unlawful Actsagainst the Safety of Maritime Navigation, 10 Mar 1988, and the Protocol to the abovementionedConvention for the Suppression of Unlawful Acts against the Safety of Fixed Platforms locatedon the Continental Shelf.

    3 See United Nations General Assembly Resolutions 40/61 and 42/159.4 European Convention on the Suppression of Terrorism, adopted at Strasbourg on

    27 Jan 1977.5 International Convention for the Suppression of Terrorist Bombings, adopted at New York

    on 15 Dec 1997. It covers various offences e


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