A car bomb has exploded near a military base north of Baghdad, killing at least 32 people and wounding scores more.
The blast struck around midday as Iraqi troops were leaving a base in Taji, 20km north of the capital.
Officials said many of the wounded were soldiers. They warned the death toll could rise further because several of the injuries were serious.
The attack was the deadliest in Iraq in more than a week.
On 27 October, insurgents unleashed a string of bombings and other attacks around the country that left at least 40 people dead.
It was the second bombing in Taji in less than 24 hours.
Yesterday, police said a car bomb struck an army patrol not far from the site of today's blast.
Eight people were injured yesterday.
Another bombing yesterday near an outdoor market in a Shia neighbourhood on Baghdad's outskirts killed four.
In Iraq's north, the president of the country's self-rule Kurdish region urged Kurds in neighboring Syria to stay united and not let political differences devolve into violence.
The comments by Massoud Barzani, posted yesterday evening on the regional government's website, point to growing concern in Iraq that infighting among Syrian Kurds could complicate that country's civil war and risk destabilising Iraq's Kurdish region.
Syria's Kurds have been solidifying control over territory where they live amid the tumult of the conflict.
Mr Barzani over the summer brokered an agreement between rival Kurdish Democratic Union Party and the Kurdish National Council, the main Kurdish umbrella group, in Syria to jointly control Kurd-populated areas together.