A/RES/58/81 expert advice is provided to those States requiring and requesting assistance in becoming parties to the conventions and protocols referred to in paragraph 7 above; 9. Notes with appreciation and satisfaction that, consistent with the call contained in paragraph 7 of resolution 57/27, a number of States became parties to the relevant conventions and protocols referred to therein, thereby realizing the objective of wider acceptance and implementation of those conventions; 10. Reaffirms the Declaration on Measures to Eliminate International Terrorism, contained in the annex to resolution 49/60, and the Declaration to Supplement the 1994 Declaration on Measures to Eliminate International Terrorism, contained in the annex to resolution 51/210, and calls upon all States to implement them; 11. Urges all States and the Secretary-General, in their efforts to prevent international terrorism, to make the best use of the existing institutions of the United Nations; 12. Welcomes the efforts of the Terrorism Prevention Branch of the United Nations Office on Drugs and Crime in Vienna, after reviewing existing possibilities within the United Nations system, to enhance, through its mandate, the capabilities of the United Nations in the prevention of terrorism, and recognizes, in the context of Security Council resolution 1373 (2001), its role in assisting States in becoming parties to, and implementing, the relevant international conventions and protocols relating to terrorism; 13. Invites regional intergovernmental organizations to submit to the Secretary-General information on the measures they have adopted at the regional level to eliminate international terrorism; 14. Welcomes the important progress attained in the elaboration of the draft comprehensive convention on international terrorism during the meetings of the Ad Hoc Committee established by General Assembly resolution 51/210 of 17 December 1996 and the Working Group of the Sixth Committee established pursuant to General Assembly resolution 57/27; 15. Decides that the Ad Hoc Committee shall continue to elaborate a draft comprehensive convention on international terrorism, shall continue its efforts to resolve the outstanding issues relating to the elaboration of a draft international convention for the suppression of acts of nuclear terrorism as a means of further developing a comprehensive legal framework of conventions dealing with international terrorism, and shall keep on its agenda the question of convening a high-level conference under the auspices of the United Nations to formulate a joint organized response of the international community to terrorism in all its forms and manifestations; 16. Decides also that the Ad Hoc Committee shall meet from 28 June to 2 July 2004 to continue the elaboration of a draft comprehensive convention on international terrorism, with appropriate time allocated to the continued consideration of outstanding issues relating to the elaboration of a draft international convention for the suppression of acts of nuclear terrorism, that it shall keep on its agenda the question of convening a high-level conference under the auspices of the United Nations to formulate a joint organized response of the international community to terrorism in all its forms and manifestations, and that the work shall continue, if necessary, during the fifty-ninth session of the General Assembly, within the framework of a working group of the Sixth Committee; 4