Updated

While most former ISIS strongholds in Iraq and Syria have been liberated, several thousand kidnapped women and children of the Yazidi minority group remain unaccounted for and are enslaved in neighboring Turkey, according to families and rescue groups.

“We are finding many of our women, our girls, our kids in Turkey,” Hussein Al-Qaidi, director of the office of kidnapped and rescue affairs run by the Kurdistan Regional Government (KRG) Prime Minister’s office in the city of Duhok, told Fox News.

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Hussein Al-Qaidi, director of the Kurdistan Regional Government's Prime Minister's Office of Kidnapped and Rescue Affairs (Fox News/Hollie McKay)

“What happens is most are given fake IDs or marriage certificates. Their names are changed to Muslim names, and they become part of another family. And then they are smuggled over the border from Syria.”

Data given to Fox News by the KRG prime minister's office shows roughly half of the 6,417 taken in captive by ISIS when they occupied the Sinjar area of Syria - the ancestral homeland of the Yazidis - remain unaccounted for. Among those rescued were 1,151 teen girls and women over the age of 15, 336 boys and men of the same age group, and 858 children under 15.

That leaves some 3,132 Yazidis still missing. And while Al-Qaidi anticipates many of those missing have been killed, he said a “significant number” are believed to be enslaved across Syria and Turkey.

Among those rescued was 21-year-old Shaza, who returned home from Ankara, Turkey on Jan. 9 – more than three years after being taken and forced into marriage as a "second wife" to an ISIS fighter.

Shaza was smuggled into Turkey last fall along a "secret way," with family members of the ISIS husband who stayed behind to fight in Syria as Iraqi troops closed in.

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Shaza, 21, a Yazidi who was forcibly held as an "ISIS wife" in Iraq, Syria and Turkey (Fox News/Hollie McKay)

For the next few months, Shaza said, she remained bound to an Ankara apartment as a slave, before being salvaged in a rescue operation involving smugglers and middle men.

“Thanks to God I am alive,” she told Fox News.

Jaqueline, now 10, was just seven when she was whisked from her village and transferred to what was then an ISIS stronghold of Tel Afar. She was then sold to the family of an ISIS leader, Waleed, and his wife, Zena.

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Jacqueline, 10, was just seven when she was kidnapped and held as a Yazidi slave before being rescued from Ankara, Turkey earlier this year

The family moved to Syria in early 2017, and Jaqueline said she was then smuggled with their extended family over the border into Turkey, where she spent another six months in Ankara. She recalls  the family referring to her as "our daughter" when questioned at checkpoints by officials.

Jacqueline said she was forced to work long hours for the family, essentially functioning as a domestic servant. “They treated me very badly, making me clean for them all day, and all night, while the wife did nothing."

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Looking out at Syria from the Turkish border town of Kilis (Fox News/Hollie McKay)

But suddenly one day last July, Jacqueline said, she was informed she was “going home.” She was put on a plane to Baghdad, where one of her captive’s brothers had flown weeks earlier, where he was stopped by a member of the paramilitary group Popular Mobilization Forces (PMF). That led to some sort of deal that secured Jacqueline's release.

Most rescue cases are coordinated and funded by Al-Qaidi's office, who in turns works with Iraqi and Turkish security agencies to secure family reunifications. Al Qaidy declined to discuss the details of rescue operations, but emphasized the work from Turkey is “difficult but not impossible."

A spokesperson for the Turkish Embassy in Baghdad told Fox News that Turkish authorities "have worked with Iraqi counterparts, especially with the Iraqi Ministry of Migration and Displacement, as well as Iraqi Border Authority, in a cooperative manner to ensure the safe return of refugees, including Yazidis.”

According to documents viewed by Fox News, the first Yazidi rescue from Turkish territory took place in December, 2016 - a 23-year-old woman named Watha. Since then, 15 other rescue operations have successfully been carried out all over Turkey – most recently on April 4. But al-Qaidy said he knows it will take many more rescues, particularly since most of those being held are “very young.”

One of the challenges of cross-border rescues is to first prove a Yazidi is being held against their will. This often requires DNA proof.

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Lazem, now six, was just three when he was bought by a woman to be an “ISIS son." He was forced to convert to Islam, renamed “Abdullah,” issued a new identity card to match that of his ISIS family, and spirited away to Turkey.

But after his real father, Kassim, received credible information Lazem was in Turkey, a trip was coordinated for him to personally travel there, and provide a DNA sample.

Forty-five days later, on Sept. 9 last year, Lazem and his father were reunited. But because of his age and the length of time he was gone, Lazem didn't even recognize his father.

The boy had also forgotten his native language, the Kurdish dialect of Kurmani, and could speak only Turkmen and Turkish.

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Enas, 5 - a young Yazidi recently rescued from Turkey - and her Uncle Hassam (Fox News/Hollie McKay)

The trauma seems to still weigh on Lazem. In a Fox News interview with Lazem and his father, the boy rarely made eye contact, and spoke up only to ask when his mother and three brothers – all also taken by ISIS – are coming home.

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The quiet Turkish-Syrian border town of Kilis, where many Syrians have fled from the warzone (Fox News/Hollie McKay)

The chances of that reunification might depend on where his mother and brothers are being held. Yazidis captive in Turkey actually might stand a better chance of being returned home than those who are trapped with remaining ISIS forces in Iraq and Syria.

Enas, a cheerful eight-year-old girl, was found in Syria late last summer after the ISIS family that took her essentially sold back her freedom. The mission to get enough money to return her took months, but paid off. She was quietly moved out of Syria first to Turkey, then back home to Iraq.

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The decimated Yazidi town of Sinjar, whereby thousands of Yazidis were kidnapped by ISIS militants and remain missing (Fox News/Hollie McKay)

The "buyback" rescue is very common. More often than not, the families of the missing are contacted or discover where their loved ones are being held, and work though Al-Qaidi's office to help collect and deliver the money.

But, al-Qaidi lamented, that process and the defeat of ISIS has produced a sharp rise in the cost of ongoing rescues.

“There are many cases still in Turkey we know of, and we want them home,” he added. “We will continue this process until the last of our people is brought home.”