Prime Minister Haider al-Abadi has previously resisted signing off on the deployment of Shia militias, out of fear of such a backlash. But it comes amid growing concern over the plight of civilians in the besieged town
About 500 people have been killed in the fighting for Ramadi in recent days and between 6,000 and 8,000 have fled, a spokesman for the provincial governor said.
ISIL said that in Ramadi it had seized tanks and killed “dozens of apostates,” its description for members of the Iraqi security forces.
It was the biggest victory for ISIL in Iraq since security forces and Shia paramilitary groups began pushing the fighters back last year, aided by air strikes from a U.S.-led coalition.
The city's fall is a major setback for the Iraqi forces and the U.S.-led coalition fighting ISIL.
It was also a harsh return to reality for Washington, which over the weekend mounted a successful Special Forces raid in Syria in which it said it killed an ISIL leader in charge of the group's black market oil and gas sales.
The United States downplayed the fall of the city on Monday, with U.S. Secretary of State John Kerry saying he believed ISIL's offensive would be reversed.
“I am convinced that as the forces are redeployed and as the days flow in the weeks ahead that's going to change, as overall [they] have been driven back ... I am absolutely confident in the days ahead that will be reversed,” Kerry said during a visit to Seoul.
The Iraqi government had vowed to liberate Anbar after routing ISIL fighters from Tikrit. But the security forces, which partly disintegrated under an ISIL onslaught last June, have struggled to make progress in the vast desert province.
An officer who withdrew from the besieged army base said ISIL — known in Arabic as Daesh — were urging them via loudspeaker to discard their weapons, promising to show mercy in return.
“Most of the troops withdrew from the operations command headquarters and Daesh fighters managed to break in from the southern gate,” the officer said. “We are retreating to the west to reach a safe area.”
Earlier on Sunday, Anbar provincial council member Athal Fahdawi described the situation in Ramadi as “total collapse.”
It was one of only a few towns and cities to have remained under government control in the desert terrain, which borders Saudi Arabia, Syria and Jordan.
ISIL now controls large parts of Iraq and Syria as a self-proclaimed caliphate in which it has massacred members of religious minorities and slaughtered Western and Arab hostages.
The United States and its allies have been pounding the group for months with air strikes in Iraq and Syria. In the 24 hours up to 1.00 a.m. ET on Sunday, the U.S.-led coalition carried out seven air strikes near Ramadi.
Al Jazeera and wire services
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