A former aide to late Iraqi president Saddam Hussein and a leader of Iraq’s insurgency, Ezzat Ibrahim al-Douri, may have been killed by Iraqi forces and Shiite militias involved in an operation against insurgent forces.

Raed al-Jubouri, the governor of Salahuddin province, told al-Arabiya television that al-Douri had been killed, and the station broadcast a photo of a dead man who looked like al-Douri.

“This is a major victory for those involved in the operation,” al-Jubouri said.

“He is considered a mastermind for this terrorist group,” he said, referring to Islamic State, an offshoot of Al Qaeda which has taken swathes of Syria and Iraq.

“For sure this will have an impact on them … There will be a break among them,” he said.