A suicide bomber has detonated explosives during evening prayers at a mosque in Iraq, killing at least nine people, officials have said.
At least 10 people were also wounded in the attack in Falluja, west of Baghdad.
Reports suggested the mosque's imam, who had been an outspoken opponent of al-Qaeda, was killed in the bombing.
Elsewhere in Iraq, three people have been killed during clashes between police and Shia Muslims at a festival in the holy city of Karbala.
Fighting was sparked when Shia pilgrims became angry at strict security measures imposed at the religious festival.
Police opened fire, killing three people and wounding 13 more.
Hundreds of thousands of Shias flock to the city each year to mark the birthday of the 9th Century Imam Mahdi.
Tight security has been put in place because Sunni insurgents often launch attacks on such festivals.
The violence came a day after Iraqi Prime Minister Nouri Maliki announced a deal between Iraqi Shia, Sunni and Kurdish politicians.
US President George W Bush welcomed the deal, but warned that much work remained to quell sectarian violence in the country.