Syrian opposition politicians are meeting in Qatar amid international pressure for the fractious opposition to unite.
A group of nuns held by Syrian rebels since December has been set free. The Greek Orthodox nuns were released as part of a rare prisoner exchange deal between the rebels and Syria's government.
Saudi Arabia, the United Arab Emirates (UAE) and Bahrain have said they are withdrawing their ambassadors from Qatar over its alleged breach of a regional security deal not to interfere in each other's internal affairs.
Saudi Arabia has listed the Muslim Brotherhood and a number of other groups as terrorist organizations. The Brotherhood has been the target of many Gulf nations since Egypt's Mohammed Morsi was ousted last July.
A suicide bombing in Iraq's southern city of Hilla has killed and wounded dozens of people. The attack came as the Iraqi leader blamed Saudi Arabia and Qatar for fueling the latest violence.
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