Violence in Iraq killed more than two dozen people Saturday, part of a surge in unrest that has sparked fears the country may be slipping back into widespread conflict.

The deadliest attack occurred north of Baghdad in the town of Dujail, where at least six security personnel died when a suicide bomber drove his explosive-laden car into an army checkpoint.  At least 15 people were wounded.

Also north of Baghdad, a bomb blast in Tarmiyah killed at least four people.  Another bombing in Dawr killed three Sunni anti-al-Qaida militiamen.

The casualties come a day after Iraqi forces launched an operation to retake areas near Fallujah, a city west of Baghdad in Anbar Province.  Parts of the city have been held by al-Qaida-linked fighters for more than four months.

Medical sources at least 11 people have been killed and 20 wounded in shelling around Fallujah.

Militants tied to the al-Qaida-linked Islamic State of Iraq and the Levant, known as ISIL, have battled government forces for control of Fallujah.

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