One of the Islamic State terror group's most senior leaders is reportedly dead, killed in what Iraq is describing as a U.S.-supported operation.

Iraqi Prime Minister Mohammed Shia al-Sudani posted on social media Friday that the country's intelligence service "successfully eliminated" IS deputy caliph Abdallah Makki Muslih al-Rufay'i.

Sudani did not say when or how al-Rufay'i was killed, calling the death a "significant security achievement."

Iraqi special forces, in a subsequent post on the X social media platform, said al-Rufay’i was killed Thursday in an airstrike targeting his location in Iraq’s Anbar desert.

Officials said the strike was the result of a two-year effort to track his location, with breakthroughs coming in the past six months.

The officials also said they arrested seven additional IS members, including two women, in a follow-up operation in Anbar. Intelligence collected at the scene of the airstrike further led to the arrest of another five people in the northern Iraqi city of Irbil.

Iraqi officials said that al-Rufay'i, also known as Abu Khadija, was the top IS official for Iraq and Syria, and that he also played a key role in the group's external operations.

A recent United Nations report, based on intelligence from U.N. member states, said al-Rufay'i ran IS operations across Iraq, Syria, Turkey and other parts of the Middle East.

Other U.N. intelligence reports have identified al-Rufay'i as a member of IS' delegated committee, viewed as the terror group's most influential executive body.

U.S. officials have yet to comment on the Iraqi claims.

Various intelligence estimates put the number of IS fighters across Iraq and Syria at between 1,500 and 3,000, with the majority operating out of Syria.

U.S. military officials warned in July of a possible IS resurgence in the region, saying the terror group was on a pace to more than double the number of attacks it had carried out in Iraq and Syria the previous year.

More recently, in December, U.S. forces carried out a series of airstrikes against IS in Syria, hitting targets in areas abandoned by counterterror forces loyal to former Syrian president Bashar al-Assad.

Despite those operations, intelligence shared by the U.N. indicated IS has been trying to take advantage of the fall of the Assad regime and resulting political turmoil.

The U.N. report also said IS "maintained the ability to operate and replace field commanders."

Yet while Iraq and Syria are central to IS' founding ideology, there has been a growing consensus among intelligence officials and experts that the terror group no longer sees the Middle East as its base for global operations.

Officials, including those from the U.S., have said there is growing confidence that the group is now being led by Abdul Qadir Mumin, who has been based in Somalia, where he rose to prominence as the emir of the group's Somali affiliate, IS-Somalia.

An offensive launched by forces in Somalia's Puntland region earlier this month, in part to chase after Mumin, has met with surprising success, pushing IS-Somalia out of some of its key strongholds.

But the campaign has yet to find any traces of Mumin or other top IS leaders.