Gunmen killed five worshippers at a Sunni mosque in Baghdad on Saturday, the latest in a surge in violence that has sparked fears of a return to all-out sectarian war.
The militants fled the scene after carrying out the attack, which came during early morning prayers in the predominantly-Shia neighbourhood of Baghdad Jadidah, in the capital's east, two security officials said, speaking on condition of anonymity.
One worshipper was also wounded in the shooting. A medical source confirmed the toll.
Just north of the capital, meanwhile, one Sunni anti-Al-Qaeda militiaman was killed and four others wounded in a bombing.
Saturday's attacks were the latest in a surge of unrest, with more than 3,800 people killed so far this year, which has sparked concerns Iraq is headed back to the all-out bloodshed that left tens of thousands dead in 2006 and 2007.
They come despite security operations targeting militants in Baghdad and to the north and west, though the government has faced charges of not dealing with the root causes of the country's worst violence since 2008.
The surge in bloodletting has coincided with demonstrations by the Sunni Arab minority against alleged ill treatment at the hands of the Shia-led government and security forces.