Britain could be flooded with tens of thousands of Isis terrorists if a new group takes charge of their holding camps, Syrian authorities have warned.

As many as 35,000 captured Isis soldiers have been held in detention facilities by the Syrian Defence Force (SDF) since the terror group suffered dramatic losses in 2019.

More than 8,000 foreign former jihadists are still detained at the camps, including British-born Shamima Begum, who travelled to Syria in 2015 with two classmates to join the terror group.

The two main detention camps in the country are al-Roj, where thousands of foreign-born terrorists and their families are holed up, and al-Hol, which holds over 32,000 Syrian and Iraqi terrorists and their families.

PICTURED: Shamima Begum in the Al-Roj camp in northern Syria

The detainees are currently located in a de-facto autonomous region of the country, known as the Democratic Autonomous Administration of North and East Syria (DAANES).

The area is controlled by the Kurdish majority, who fought alongside Britain and other Western forces to liberate large parts of the country from the hands of Isis.

Roughly 2,000 American troops have supported the Kurdish authorities in the area since 2019, which have received significant funding from Western nations, including Britain.

However, fears are growing in the autonomous region that the new Syrian regime, spearheaded by former Al-Qaeda fighter Abu Mohammed al-Jolani, could take over control of the detention facilities.

The detainees are currently located in a de-facto autonomous region of the country

Soldiers fighting under the ruling Hayat Tahrir al-Sham (HTS) have been seen wearing Isis-affiliated symbols after atrocities were committed against Syria's minority Christian, Alawite and Druze communities.

In June, an Isis insurgent killed 25 worshippers at a Greek Orthodox church in Damascus.

The Kurdish-run SDF and HTF have entered into talks surrounding the war-ravaged country's future.

But the al-Hol Camp co-chairwoman, Jihan Hanan, warned the Express that Isis may be reborn if the detention camps fell under the control of HTS.

In June, an Isis insurgent killed 25 worshippers at a Greek Orthodox church in Damascus

Ms Hanan said: "Isis are still here in Syria, they can revive at any minute, right now in al-Hol camp if another side took over the camp, just give it 24 hours and ISIS will be reborn again.

"If the SDF stopped being in control, Isis will return and a big war would happen.

"We will face a big challenge [if HTS took over], it will be really difficult for us because the war against Isis is not only a war fought using weapons, it's also a war against an extremist ideology that we are facing right now.

"I say that in my opinion the SDF are the ones that are able to protect [the West] and the camp and fight against Isis."

She also revealed the SDF has not received any assurances from the HTS regime over the facilities' future.

Speaking on the recent atrocities carried out on Syria's ethnic minority communities, Ms Hanan told the newspaper: "Let's not look at [Jolani's] background, let's not look at his past, let's look at what is happening right now under HTS.

"We have a lot of fear the genocides happening elsewhere in Syria are going to happen here.

"In the years SDF have been fighting Isis, I've never seen a genocide happening, I have not seen the SDF breaking humanitarian standards according to the UN, I see that the SDF are able to protect these camps.

"If another regime came and took control, or took administration of this camp, it would be really hard because they don't have the experience not only fighting Isis, but also fighting the extremism."