UN Security Council
1989

Resolution 635 (1989) of 14 June 1989 The Security Council, Conscious of the implications of acts of terrorism for international security, Deeply concerned by ail acts of unlawful interference against international civil aviation, Mindful of the important role of the United Nations in supporting and encouraging efforts by all States and intergovernmental organizations in preventing and eliminating all acts of terrorism, including those involv ing the use of explosives, Determined to encourage the promotion of effective measures to prevent acts of terrorism, Concerned about the case with which plastic or sheet explosives can be used in acts of terrorism with little risk of detection, Taking note of the International Civil Aviation Organization Council resolution of 16 February 1989, in which it urged its member States to expedite current research and development on detection of explosives and on security equipment, 1. Condemns all acts of unlawful interference against the security of civil aviation; 2. Calls upon all States to co-operate in devising and implementing measures to prevent all acts of terrorism, including those involving explosives;