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(Image: GETTY)

The Iraqi PM made the announcement as his forces overran the city of Mosul.

Mosul is the group’s last stronghold in Iraq and has symbolic value.

While their last territory in Syria is already being squeezed.

US-backed forces claim they have fully encircled Raqqa, the ISIS capital.

PM Haider al-Abadi, declaring victory, said the terrorists' "state of falsehood" was over.

Referring to them by the nickname Daesh, he said Mosul’s Great Mosque of al-Nuri had been liberated.

"The return of mosque and minaret to the fold of the nation marks the end of the Daesh state of falsehood," he said.

It was within the mosque that the ISIS caliphate was declared by terror boss Abu Bakr al-Baghdadi.

He declared himself the world leader of all Muslims and called for the faithful to back him.

Now Mr Abadi has pledged to “to kill and detain ISIS fighters, down to the last one”.

The fall of Mosul marks the effective the end of the Iraqi half of ISIS.

(Image: GETTY)

However, the hardline group would still control territory west and south of the city.

The army said up to 350 militants were still in the city last week but many have been killed since.

They are besieged in one square kilometre – less than 40% of the Old City and less than 1% of Mosul’s total area.

In Raqqa, a lack of fighters and ammo has forced ISIS to focus its defence on key positions, the Syrian Observatory for Human Rights claims.