United Nations Security Council resolution 671, adopted unanimously on 27 September 1990, after recalling resolutions 598 (1987), 619 (1988), 631 (1989), 642 (1989) and 651 (1990), and having considered a report by the Secretary-General Javier Pérez de Cuéllar on the United Nations Iran–Iraq Military Observer Group, the Council decided:
(a) to renew the mandate of the United Nations Iran–Iraq Military Observer Group for another two months until 30 November 1990;
(b) to request the Secretary-General, after discussions with both parties, to report on the future of the Observer Group with his recommendations during November.
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