OMAR OIL FIELD —

US-backed forces pressed the battle to expel diehard militants from the last pocket of land under their control in eastern Syria on Tuesday after hundreds fled the holdout overnight.

The extremist group declared a cross-border “caliphate” in Syria and Iraq in 2014, but various military campaigns have chipped it down to a fragment on the Iraqi border.

After a pause of more than a week to allow out civilians, the Syrian Democratic Forces (SDF) declared a last push to retake the “Baghouz pocket” from the extremists on Saturday.

Aided by the warplanes and artillery of a US-led coalition, the Kurdish-led alliance has made way into a patch of four square kilometers (one square mile).

SDF spokesman Mustafa Bali said heavy clashes were ongoing on Tuesday, after hundreds fled the battle zone overnight.

“A group of 600 civilians escaped from Baghouz at one in the morning and they are being searched now,” he said.

The Syrian Observatory for Human Rights said the new arrivals included women and children from France and Germany.

“Most of those who got out are foreigners,” observatory chief Rami Abdel Rahman said.

Coalition spokesperson Sean Ryan said US-backed forces were facing a fierce fightback.

“The progress is slow and methodical as the enemy is fully entrenched and Daesh (the so-called IS) fighters continue to conduct counter attacks,” he said.

“The coalition continues to strike at Daesh targets whenever available.”

The SDF launched the battle to expel Daesh from the eastern province of Deir Ez-Zor in September, slowly tightening the noose around the militants and their families since December.

French women

In the past two months, more than 37,000 people, mostly wives and children of militant fighters, have fled into SDF-held areas, the observatory says.

That figure includes some 3,400 suspected militants detained by the SDF, according to the Britain-based monitor, which relies on sources inside Syria for its information.

On Monday, AFP saw dozens of new arrivals at an SDF-held screening location.

Dozens of coalition and SDF fighters were stationed at a screening point for new arrivals from Daesh areas.

Coalition forces stood over about 20 men who were crouching on the ground.

Two French women told AFP they paid smugglers to take them out of the battered Daesh-held holdout, but Iraqi militants had prevented other foreigners from leaving. “They said only the Syrians and Iraqis can be smuggled out,” said one of the women, who gave her first name as Christelle, from the city of Bordeaux.

Bali, the SDF spokesman, said on Saturday that up to 600 militants could remain inside the pocket.

But the group’s elusive leader Abu Bakr Al-Baghdadi who proclaimed the “caliphate” in 2014 was likely not there, he said.

At the height of their proto-state, Baghdadi’s followers implemented their brutal implementation of Islamic law in an area the size of the United Kingdom.

But various offensives, including by the US-backed SDF and Russia-backed regime forces, have taken back all but a morsel of that territory near the village of Baghouz. — AFP