United Nations Security Council resolution 1145, adopted unanimously on 19 December 1997, after noting the termination of the mandate of the United Nations Transitional Authority for Eastern Slavonia, Baranja and Western Sirmium on 15 January 1998 in accordance with Resolution 1120 (1997), the Council authorised a support group of 180 civilian police monitors, known as the United Nations Civilian Police Support Group (UNPSG), to observe the situation in eastern Croatia for an additional nine months.[1]