Agostini told Italian Rai state TV that Iraqi armed forces members were also injured in the blast but didn’t say how many.
An Iraqi security official said the bomb exploded next to their vehicle as they were traveling just outside Kirkuk, wounding six Italian soldiers.
The discrepancy in the number of wounded wasn’t immediately explained.
Italy’s wounded were evacuated by U.S. military helicopters to hospital in Baghdad.
One Italian soldier lost a leg to amputation due to injuries from the bomb and another suffered serious internal injuries, Italian Gen. Nicola Lanza de Cristoforis told state TV.
Iraq declared victory against IS militants two years ago, but the group continues to stage insurgent-type attacks across the country, particularly in northern Iraq.
Italy currently has more than 800 regular soldiers and some 80 special forces in Iraq.
Qassim Abdul-Zahra in Baghdad contributed.
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