Iraq declared victory against the Islamic State group last year, but small jihadist cells still wage attacks, especially in mountainous areas like the northern province of Kirkuk.

There, IS has attacked state infrastructure and government officials, especially targeting local administrative heads known as "mukhtars."

The latest victim, on Friday night, was mukhtar of the village of Mahmudiya near the town of Hawija.

The town has long been a bastion of radical Sunni Muslim groups and was one of the last IS holdouts retaken by government troops last year.

Mahmudiya mukhtar "Abdallah al-Wasmi was executed by Daesh members who attacked his home," a local security official told AFP, using the Arabic acronym for IS.

His death followed the similar killing of the mukhtar of a nearby village, Hanutiya, late Wednesday.

And on Monday, a provincial official told AFP that "IS fighters attacked the home of Mohammad Jumaa, the mukhtar of the village of Jassemiya", also near Hawija.

"They took him out of his house and executed him in front of it before fleeing," the official said.

The recent killings bring to nine the number of village chieftains executed by IS in the past seven months in Kirkuk province.