ISIS leader Abu Bakr al-Baghdadi is at death’s door after being poisoned by a mystery assassin in Iraq, it has been reported.

Three other senior jihadis were also afflicted by the toxin in Al-Ba’aj, southwest of Mosul – Islamic State’s biggest city in Iraq. The four have reportedly been rushed for treatment at a secret location.

FARS, an Iranian news agency, say that ISIS is now arresting several suspects to find out who has struck a blow at the terror group’s self-proclaimed ‘Caliph’.

The evil Iraqi cleric is known to have been personally responsible for the rape and torture of US aid worker Kayla Mueller.

He forced the 26-year-old to marry him, before repeatedly raping her.

Mueller was killed during a Jordanian airstrike on ISIS in February last year.

Baghdadi was previously held by US forces in the city of Fallujah in 2004 during their invasion of the country.

Baghdadi was released within six months and would go on to be declared the leader of ISIS – then known as al-Qaeda in Iraq – in 2010.

If the reports are true, it would not the first time al-Baghdadi has been injured. In 2015 he was severely hurt in a US airstrike in Syria.

In June of this year, rumours surfaced that he was killed by a US airstrike in ISIS 'capital' Raqqa, but they were later found to be false.