Two more Islamic State brides are believed to have been stripped of their UK citizenship while being held in Syrian detention camps with their young children.
The disclosure came amid a political row over the death of a 3-week-old baby whose teenage mother had been stripped of her British citizenship last month.
Shamima Begum was left in a detention camp in Syria where her baby died, the third of the 19-year-old's children to die since she travelled to Syria in 2015.
Reema Iqbal, 30, along with her sister Zara, 28, are mothers of five children between them and are currently living in a refugee camp.
Legal sources say the sisters have had their UK citizenships revoked after marring into a terror cell linked to the execution of western hostages.
The decision to remove their UK nationality has sparked new fears regarding the fate of the children of Islamic State brides.
The two women left Newham in London in 2013 for the Isil Caliphate. Their parents are originally from Pakistan and the Home Office could pursue the argument they are Pakistani nationals.
Just last month, Reema Iqbal said she had hope of returning to the UK.
"The security services came to speak to me and I was honest, I told them my whole story so now it's up to them to judge. I don't know if my Mum every got me a Pakistani passport or not, I've never been to Pakistan," she told The Telegraph.
"There's not enough food for bigger families. It's a prison here, but we're serving no sentence. If I face court, fine, but take me back to the UK, that's where I'm from."
The decision to leave an innocent child in a refugee camp where infant mortality rates are high has been described by the opposition Labour Party was morally reprehensible.
Home secretary Sajid Javid came under fire following the withdrawal of Shamima Begum's citizenship who claimed his priority was the safety and security of Britain.
Polls suggested the move was popular among the public but it attracted criticism from opposition parties and human rights lawyers.
"Clearly Shamima Begum holds abhorrent views, Phillip Lee, former justice minister and member of Theresa May's party told BBC radio.
"But she was a child. She is a product of her society … and I think we had a moral responsibility to her and her baby, Jarrah.
"I was troubled by the decision. It seemed driven by a populism, not by any principle that I recognised."
Shadow home secretary Dianne Abbott blamed Javid's decision to remove Begum's citizenship for the child's death, accusing him of breaking international law.
"The tragic death of Shamima Begum's baby, Jarrah, is a stain on the conscience of this government," she said.
"The Home Secretary failed this British child and he has a lot to answer for."
An unrepentant Begum sparked a debate in Britain as to whether a teenager with a jihadist fighter's child should be left in a war zone to fend for herself.
The renewed criticism has also shown the difficulty governments face when dealing with the ethical, legal and security ramifications of allowing militants and their families to return.
Begum's father Ahmed Ali offered an apology to the British public for his daughter's decision to flee the country and join the terror group.
The apology disclosed the news of the child's death.
Ali has urged the British government to "take her back and punish her if she had done any mistake".