A series of bomb attacks killed at least 26 people in central Iraq, police and medical officials say.
Fifteen died when a suicide bomber target a funeral for a pro-government Sunni militiaman in a village south of Baquba, the capital of Diyala province.
Car bombs meanwhile exploded in four parts of Baghdad, killing at least 11 people and wounding dozens more.
Fifteen people died when a suicide bomber target a funeral for a pro-government Sunni militiaman in a village south of Baquba
There has been a surge in sectarian violence across Iraq in the past year, reaching levels not seen since 2007.
According to the UN, 7,818 civilians and 1,050 members of the security forces died in 2013. December alone saw at least 759 killed.
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Secretary of State John Kerry has said the US will help Iraq fight al-Qaeda-linked militants, but that it is not planning to send troops back to the country.
John Kerry said he was confident the government of Iraqi PM Nouri Maliki could defeat the militants.
Earlier, the Iraqi government said it had lost control of the strategic city of Fallujah, west of Baghdad.
Al-Qaeda-linked militants now control the south of the city.
An Iraqi reporter there says tribesmen allied with al-Qaeda hold the rest of Fallujah.
John Kerry made the comments as he left Jerusalem for Jordan and Saudi Arabia to discuss his effort to broker peace between Israel and the Palestinians.
“We will stand with the government of Iraq and with others who will push back against their efforts to destabilize,” he said.
John Kerry has said the US will help Iraq fight al-Qaeda-linked militants, but that it is not planning to send troops back to the country
“We are going to do everything that is possible. I will not go into the details.”
He added: “We are not contemplating putting boots on the ground. This is their fight.”
The head of the police in Anbar province – Hadi Razeij – said on Saturday that his men had pulled back to the city walls and the people of Fallujah were “the prisoners of Isis”.
Fighting there erupted after troops broke up a protest camp by Sunni Arabs in the city of Ramadi on Monday.
They have been accusing the Shia-led government of marginalizing the Sunnis.
Local Sunni Arabs have been angered by what they perceive as discrimination by the government of Nouri Maliki.
They also say their minority community is being targeted by anti-terrorism measures implemented to stem the surge in sectarian violence.
In recent months, Sunni militants have stepped up attacks across Iraq, while Shia groups began deadly reprisals – raising fears of a return to full-scale sectarian conflict.
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Iraqi army has lost control of the strategic city of Fallujah, west of Baghdad, eyewitnesses say.
Al-Qaeda-linked militants now control the south of the city. An Iraqi reporter there says tribesmen allied with al-Qaeda hold the rest of Fallujah.
Fighting there erupted after troops broke up a protest camp by Sunni Arabs in the city of Ramadi on Monday.
They have been accusing the Shia-led government of marginalizing the Sunnis.
The recent fighting in Fallujah and Ramadi has pitted government troops on the one hand and the Islamic State of Iraq and the Levant (Isis), which is affiliated with al-Qaeda, and Sunni tribesmen on the other.
Local Sunni Arabs have been angered by they perceive as discrimination by the government of PM Nouri Maliki.
They also say their minority community is being targeted by anti-terrorism measures implemented to stem the surge in sectarian violence.
Iraqi army has lost control of the strategic city of Fallujah, west of Baghdad
Late on Saturday, eyewitnesses said al-Qaeda militants were in evidence on the streets of Fallujah, riding pick-up trucks mounted with anti-aircraft guns.
Reuters news agency said saying troops were shelling parts of the city to try to retake it.
Iraqiya state television quoted Nouri Maliki as saying: “We will not back down until we end all terrorist groups and save our people in Anbar.”
On Tuesday, he agreed to withdraw the army from towns and cities in Anbar province, to allow police to resume control of security.
But as soon as soldiers left their posts, militants aligned to al-Qaeda appeared in Ramadi, Fallujah and Tarmiya, storming police stations, freeing prisoners and seizing weapons.
Nouri Maliki reversed his decision the next day, sending soldiers back to Anbar.
But on Thursday, militants in Ramadi and Fallujah raised black flags on buildings and used the loudspeakers of mosques to call on people to join their struggle and support a “peaceful takeover”.
In recent months Sunni militants have stepped up attacks across Iraq, while Shia groups began deadly reprisals – raising fears of a return to full-scale sectarian conflict.
On Wednesday, the UN said at least 7,818 civilians and 1,050 members of the security forces had been killed in 2013.
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