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The father of Jihadi bride Shamima Begum today blamed the UK authorities for letting her flee to Syria.

Ahmed Ali claimed the teenager did not have a passport when she left her home in Bethnal Green at the age of 15 to marry an ISIS fighter. She is now in a refugee camp in Syria and wants to return to the UK with her baby.

In an interview from his home in Bangladesh, Mr Ali, 60, said: “The British immigration system is very informed, the most informed system in the world. I always say how did (Shamima) get there using another one’s passport? She doesn’t even have her own passport. These matters should be investigated.”

He also renewed calls for the government to allow his daughter to return to the UK to face punishment. British Home Secretary Sajid Javid has revoked her citizenship.

Mr Ali, who lives in the northeastern Bangladeshi district of Sunamganj with his second wife, suggested that his daughter should return to the UK and if she has committed a crime, be punished here.

He said: "My child was only 15 years old when she fled, she was immature. I would ask the British government not to cancel her citizenship, to return her citizenship, and if she is guilty, bring her back to Britain and give her punishment there."

Mr Ali said he first moved to England in 1975 but then returned to his village in Bangladesh to marry his first wife, Asma Begum, in 1990. The couple, who returned to England, had four daughters with Shamima being the youngest.

The 60-year-old later returned to Bangladesh and got married for a second time. Most recently, he came to live in Bangladesh two months ago to escape the UK winter.

Mr Ali has criticised British authorities for failing to properly deal with the issue of children who have fled to join ISIS.

He said: "One girl went there a month ago, most likely a month ago. The British government should have been alarmed about the matter, and they should have also inquired at the school to find out how she fled, since she was a student.

"Then a month later, three more students fled. The authorities should investigate at the school why these students fled. They were not adults."

Ms Begum's husband, Dutch national Yago Riedijk, said he and his wife made a mistake joining the terrorist group.

The 27-year-old married Ms Begum when she was only 15 and said the couple "definitely" made a mistake by travelling to Syria to join ISIS.

When asked if marrying an underage girl was appropriate, Mr Riedijk said: "To be honest, when my friend came and said there was a girl who was interested in marriage, I wasn't that interested because of her age, but I accepted the offer anyway."

Mr Riedijk added he tried to look after his wife as best he could and that she never really left the house or knew what was going on in the world around her.

Speaking about the Home Office’s decision to strip Ms Begum of her British citizenship to prevent her from returning to the UK, he said: "I understand any government's fear of foreign fighters or their wives but to let a young girl in her position who has lost her children, who has been through horrors in Islamic State be left here to rot in a camp, I don't think that's a very humanitarian decision, no.