The world's largest Muslim body called for a de-escalation of tensions between regional rivals Saudi Arabia and Iran, telling member countries that unity was required to eradicate terrorism.
Oil plunged to fresh 12-year lows under $27 on Wednesday, slammed by gloomy economic forecasts, China's slowdown and abundant crude supplies.
Iran's supreme leader Ayatollah Ali Khamenei warned on Tuesday against American "deceit" after Tehran finalised a landmark nuclear deal with world powers led by the United States.
Iran denounced new US sanctions on its missile programme on Monday but pushed ahead with international cooperation after its historic nuclear deal.
German industry expects a steep rise in exports to Iran following the lifting of international sanctions, and Economy Minister Sigmar Gabriel said on Sunday he would seek to drum up trade on visit Tehran in early May.
Four Iranian-American citizens freed by Iran in a prisoner swap with the United States have left Tehran and are flying to Bern in Switzerland, Iranian state television reported Sunday.
Iran took a huge step to ending its international isolation Saturday as sanctions on the Islamic republic were lifted following the entry into force of last July's momentous nuclear deal with major powers.
President Hassan Rouhani hailed on Sunday a nuclear deal with world powers as a "golden page" in Iran's history, and looked forward to an economic future less dependent on oil as the country emerges from years of sanctions and isolation.
Iran has agreed to buy 114 civil aircraft from European aircraft maker Airbus, the transport minister was quoted as saying on Saturday, ahead of the anticipated lifting of international sanctions on Iran.
Iran's Foreign Minister Mohammad Javad Zarif said nuclear-related sanctions on his country would be lifted Saturday, telling reporters in Vienna it ‘was a good day for the world’.
US crude oil futures fell in Asian trade on Friday, heading lower after posting the first significant gains for 2016 in the previous session, as the prospect of additional Iranian supply looms over the market.
US Secretary of State John Kerry and Saudi Foreign Minister Adel al-Jubeir insisted Thursday that their countries' ties remain strong despite recent tensions over Washington's outreach to Iran.
