In accordance with its mandate related to preventing and combating terrorism, the Terrorism Prevention Branch of the United Nations Office on Drugs and Crime (UNODC/TPB) is assisting States with the ratification and implementation of the 19 international conventions and protocols related to terrorism, including the seven legal instruments  out of the 19, that deal, to varying degrees, with chemical, biological, radiological and/or nuclear (CBRN) terrorism. The adoption of five new instruments in the short time period of five years - between 2005 and 2010 - generated an urgent and ever greater need for specialized technical assistance services in this field. Consequently, the promotion of the ratification and implementation of the seven legal instruments dealing with CBRN terrorism is one of the priority areas to which the Terrorism Prevention Branch is increasingly devoting its efforts, and is doing so through a variety of means, including:
For over a decade, UNODC has prioritized the promotion of the aforementioned instruments. One example of the work in this area is UNODC's High-Level Workshop on the Promotion of the Entry into Force of the 2005 Amendment to the Convention on the Physical Protection of Nuclear Material, held in Vienna on 28 and 29 October 2015. The workshop was organized in cooperation with the International Atomic Energy Agency, and contributed to the subsequent entry into force of the Amendment.
More recently, on 21 and 22 March 2018 in Vienna, UNODC held a Global Workshop to promote the universalization of the International Convention for the Suppression of Acts of Nuclear Terrorism (ICSANT), the Convention on the Physical Protection of Nuclear Material (CPPNM), and its Amendment. Over 60 participants had the opportunity to discuss the importance of becoming party to, and fully implementing, these international legal instruments.
Furthermore, UNODC and the Government of Canada co-hosted the 10 th Anniversary of the entry into force of ICSANT, which took place in Vienna on 5 December 2017 and gathered representatives from 47 Member States.
In addition, UNODC/TPB continues to review, upon request, the relevant CBRN legislation of Member States on a frequent basis.
In 2016, UNODC published a legal training curriculum module on The International Legal Framework against Chemical, Biological, Radiological and Nuclear (CBRN) Terrorism. The module is a technical assistance tool for training purposes that aims to familiarize policy and decision makers and counter-terrorism practitioners with the requirements of the relevant international legal instruments, and assist legislative drafters and criminal justice officials with their effective implementation.
It is worth noting that incorporation into national legislation of the criminalization obligations established by the seven international legal instruments related to terrorism dealing with CBRN also contributes to the fulfillment by States' of several of their obligations under United Nations Security Council resolution 1540 (2004).
Precisely to assist States with the incorporation of relevant requirements in the area of nuclear terrorism, UNODC and the International Atomic Energy Agency, jointly model legislative provisions for the implementation of the criminalization provisions of ICSANT, CPPNM, and CPPNM's 2005 Amendment.
In 2009, the Global Initiative to Combat Nuclear Terrorism granted UNODC official observer status, highlighting that "UNODC's commendable work in addressing issues related to counter terrorism, including nuclear terrorism, has already had a positive impact in promoting implementation of the universal legal framework against terrorism, including the Convention on the Physical Protection of Nuclear Material and its 2005 Amendment, United Nations Security Council Resolutions 1373 and 1540 and the International Convention for the Suppression of Acts of Nuclear Terrorism".
Participants at the 2012 United Nations High-Level Meeting on Countering Nuclear Terrorism with a Specific Focus on Strengthening the Legal Framework (28 September 2012, New York) welcomed the positive impact that "UNODC's Global Project on Strengthening the Legal Regime against Terrorism has had in increasing the number of ratifications and achieving effective implementation of the international legal instruments against nuclear terrorism" and invited Member States to avail themselves of UNODC/TPB's successful and long established technical legal assistance programme and capacity-building activities.
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 1980 Convention on the Physical Protection of Nuclear Material and its 2005 Amendment, 1997 International Convention for the Suppression of Terrorist Bombings, 2005 International Convention for the Suppression of Acts of Nuclear Terrorism, 2005 Protocol to the Convention for the Suppression of Unlawful Acts against the Safety of Maritime Navigation, 2005 Protocol to the Protocol for the Suppression of Unlawful Acts against the Safety of Fixed Platforms located on the Continental Shelf and 2010 Convention on the Suppression of Unlawful Acts relating to International Civil Aviation.