The UN was engaged in Somalia from early in 1991 when the civil strife began. UN personnel were withdrawn on several occasions during sporadic flare-ups of violence. A series of Security Council resolutions (733, 746) and diplomatic visits eventually helped impose a ceasefire between the two key factions, signed at the end of March 1992. These efforts were aided by other international bodies, such as the Organisation for African Unity, the League of Arab States and the Organisation of the Islamic Conference.