Abadi made the remarks while delivering a formal statement aired by the state television on Monday.

“I announce from here the end and the failure and the collapse of the terrorist state of falsehood and terrorism, which the terrorist ISIS announced from Mosul,” he said, adding, “It was due to the Iraqi nation’s united front and sacrifice that we are now celebrating the victory over ISIS. This is the victory over darkness and terrorism.”

Asserting that the Iraqi nation is now more united than ever, the Iraqi premier noted, “I hereby pay homage to Grand Ayatollah Ali al-Sistani and his historic fatwa, calling on all Iraqi citizens to defend their country. I also pay tribute to all Iraqi fighters and soldiers, who played a role in this battle and the families of the martyrs.”

Abadi emphasized that the Iraqi soldiers were the sole force on the ground and there were no foreigners involved in liberation of Mosul.

“Now, we bear a heavy responsibility on our shoulders to purge the liberated areas from the last remnants of ISIS and return displaced people to their homes. Iraqis must be rightly proud of this achievement as it was planned and fully implemented by them,” Abadi pointed out.

The recapture of Mosul marks the biggest blow to the Takfiri extremist group since it declared its so-called caliphate three years ago.

Abadi arrived in Mosul a day earlier to congratulate Iraq’s military commanders following nearly nine months of incessant battle to take back the country’s second biggest city from ISIS terrorists.

Abadi’s statement came after Iraqi forces mopped up the last pockets of ISIS resistance in Mosul’s Old City, where the Takfiri terrorists were surrounded in a sliver of territory about 200 by 100 meters.

Lieutenant General Sami al-Aridhi of the elite Counter-Terrorism Service said on Monday that government troops were engaged in “heavy” fighting with the remnants of ISIS militants, but the battle was drawing to an end.

“They do not accept to surrender. But operations are in their final stages, and it is likely that (the fighting) will end today,” the senior commander highlighted.

Aridhi went on to say that his forces had information that there were between 3,000 and 4,000 civilians in the area still held by ISIS members in Mosul’s Old City.

The remarks came as the United Nations said 920,000 people fled their homes in Mosul amid fierce clashes between Iraqi government forces and ISIS terrorists there.

“It’s a relief to know that the military campaign in Mosul is ending. The fighting may be over, but the humanitarian crisis is not,” Lise Grande, the UN’s humanitarian coordinator in Iraq, said in a statement.

The Office of the United Nations High Commissioner for Refugees (UNHCR) said on Monday that it could take many months before civilians are able to return to their homes.

“It is likely that thousands of people may have to remain in displacement for months to come,” the UNHCR said in a statement.

The UN refugee agency noted, “Many have nothing to go back to due to extensive damage caused during the conflict, while key basic services such as water, electricity and other key infrastructure, including schools and hospitals, will need to be rebuilt or repaired.”

Additionally, twenty-eight aid groups working in Iraq have issued a statement, calling for international support for the reconstruction of Mosul and urged Iraqi authorities not to press civilians to return.

“Remaining insecurity; lack of basic services; explosive hazards contamination; and damage to homes, businesses and public infrastructure — including schools and hospitals — all continue to pose barriers to return,” the statement signed by groups like the Norwegian Refugee Council, Oxfam and Save the Children read.

It also expressed deep concerns for Iraqis trapped in Daesh-controlled areas in Iraq, namely Tal Afar, Hawijah district in the oil-rich northern province of Kirkuk and the troubled western province of Anbar.

“For the expected offensives in Hawijah, Tal Afar and western Anbar, where approximately 150,000 civilians are thought to still be trapped, it is vital that lessons are learnt from past offensives,” the aid groups said, demanding access to safety and assistance be prioritized.

Iraqi army soldiers and volunteer fighters from the Popular Mobilization Units have made sweeping gains against ISIS since launching the Mosul operation on October 17, 2016.

The Iraqi forces took control of eastern Mosul in January after 100 days of fighting, and launched the battle in the west on February 19.

An estimated 862,000 people have been displaced from Mosul ever since the battle to retake the city began eight months ago. A total of 195,000 civilians have also returned, mainly to the liberated areas of eastern Mosul.