A girl radicalised in a family home filled with Islamic State propaganda must be removed from her parents, a judge ruled on Friday.

Bombmaking guides and pictures of beheadings were found at the home of the 16-year-old, who this week achieved a string of As and A*s at GCSE.

Mr Justice Hayden said her ‘deceitful’ mother and father had done as much harm to her as child molesters. She was suffering ‘psychological and emotional harm’ through exposure to extremism and had even tried to travel to Syria to become a jihadi bride.

At risk: A girl (left) radicalised in a family home filled with ISIS propaganda must be removed from her parents (mother pictured right), a judge ruled on Friday

The High Court judge said she needed to be safe from the pernicious influence of IS propaganda. He read out a list of the disturbing terror documents that police found on electronic files at her east London home. Some of it belonged to her, some to her siblings and parents but police say it was swapped among them all. Electronic devices said to belong to the parents showed lectures inciting armed attacks on non-Muslims.

Her flight to Syria last December was stopped by counter-terrorism officers who removed her from a Turkey-bound plane already taxiing on the runway at Heathrow.

Her parents appeared to co-operate with police and social workers and the girl, referred to in court as B, was allowed to return to the family house where she was being home taught.

Judge Anthony Hayden, pictured, today compared the radicalisation of the 16-year-old girl, known as B as similar to that as child sex abuse

The parents, who sat impassively alongside their daughter throughout the hearing, claimed they were doing everything they could to stop their children reading terrorism literature. But this was ‘a consummately successful deception’ of the authorities, the court was told.

Their daughter downloaded a manual called 44 Ways To Support Jihad and police found advice on how to avoid airport security, including a section for young women intending to travel to Syria.

The teenager also used the internet to search for the current response times of the Met Police’s firearms unit.

One of B’s siblings had downloaded news reports of men being prepared for death by Islamic State fanatics. Other downloads showed beheadings.

Putting the child into care, the judge said: ‘I can see no way in which her psychological, emotional and intellectual integrity can be protected by her remaining in this household. The farrago of sophisticated dishonesty of the parents makes this entirely unsustainable.’

Drawing an analogy with sex abuse cases, the judge added: ‘The violation contemplated here is not of the body but it is of the mind ... it involves harm of a similar magnitude.’ Referring to her high grades, Judge Hayden said the case was a tragedy for a promising young woman who had dreamt of studying medicine.

The judge said B had sent him a letter telling him of her strong loyalty to her family and desire to remain at home.

The girl, her parents and some of her siblings are on police bail after being arrested on suspicion of possessing information likely to be useful to those who wanted to commit terrorist acts. Judge Hayden yesterday ordered the family’s passports to be handed to Scotland Yard.

He said the case was one of a number in Tower Hamlets where bright young girls had been seduced by Islamic State as jihadi brides, adding: ‘The reality is the future for such women in Syria, as we know, holds only exploitation, degradation and death.

‘These children with whose future I have been concerned have been at risk of really serious harm, and as such the state is properly obligated to protect them.’