 Both countries are members of the Arab League and Organisation of Islamic Cooperation.During the early 1970s relations between Oman and the neighboring People's Democratic Republic of Yemen (South Yemen) deteriorated, following conflict in Dhofar Province with a guerrilla organization, known from 1974 as the People's Front for the Liberation of Oman, which the South Yemeni government supported.Although a cease-fire was mediated by Saudi Arabia in March 1976, the situation remained tense.