Iran and six world powers will hold their first negotiating round since failing to meet July target date.
Human Rights Watch has denounced the killing of hundreds of pro-Morsi supporters last year.
Tripoli has struggled to rein in warring militia brigades formed after the fall of dictator Muammar Gaddafi.
Lead U.S. negotiator declined to give a final deadline for final nuclear deal.
Move will delay the formation of an urgently needed power-sharing government.
Selection of moderate Sunni Islamist may be first step towards the creation of a coalition government.
Security areas were hit by two successive explosions.
The strike is just the latest challenge faced by the unity government, which is grappling with internal tensions.
Extremist militants released short clip with captive British journalist.
President Barack Obama phoned new Iraqi P.M. to discuss commitment to defeating militants.
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