Between 1956 and 1959 the Legal Committee of the International Civil Aviation Organisation made preliminary studies into the question of offences on board aircraft. In 1959 the Committee drew up a draft Convention which was revised in the light of comments received from member States. The revised draft Convention was presented by the I.C.A.O. Council to a Diplomatic Conference in Tokyo and after further amendments had been made the Convention on Offences and Certain other Acts Committed on Board Aircraft was signed in Tokyo on 14 September 1963.