UPDATE 1-Iraq hosts regional rivals Iran and Saudi Arabia at conference

Iraq hosted senior parliamentary officials from arch-rivals Saudi Arabia and Iran on Saturday as Prime Minister Adel Abdul Mahdi sought to bolster his country's nascent role as a mediator in the region.Delegations including the heads of parliament from Turkey, Kuwait, Syria and Jordan also attended the one-day conference in the Iraqi capital to discuss regional security, diplomacy and economic issues.Abdul Mahdi recently returned from visits to Iran and Saudi Arabia, both oil-super-powers that h