The nanny who decapitated a girl, four, and paraded her severed head in the streets of Moscow will never face trial, say sources close to the criminal investigation.

Gyulchehra Bobokulova, 38, claimed she was inspired to kill the helpless child in a copycat of gruesome jihadist beheadings which she watched online.

She was trusted nanny to the girl she confessed to decapitating in north west Moscow - Anastasia Meshcheryakova - in a brutal act which caused shock around the world.

Insane: Gyulchehra Bobokulova, 38, beheaded four-year-old Anastasia Meshcheryakova while was in her cot in a brutal act which caused shock around the world

Horror: In extraordinary scenes, Bobokulova held the child's head aloft and shouted 'Allahu Akbar' before she was arrested on February 29

Innocence: Four-year-old Anastasia (Nastya) Meshcheryakova was decapitated as she lay in her cot at her parents' home

Earlier, the burka-clad babysitter had claimed that she killed the child on February 29 in revenge for Putin's aerial bombardment of Muslims in Syria. She claimed she ordered by Allah to cut off the girl's head.

Now the native Uzbek and mother of three - who is the subject of a murder charge - will be ruled 'insane', a source with knowledge of the situation told Interfax news agency.

Experts of the Serbsky State Scientific Centre for Social and Forensic Psychiatry have found that the nanny is not fully responsible for her actions, and committed the crime in a bout of insanity.

Their report is to be formally handed to state investigators next week, reported Interfax.

As such, Bobokulova 'is not liable for criminal prosecution and the investigation will have to specify the necessity of administering compulsory measures of a medical nature to her in the indictment', reported Interfax.

In other words, she is likely to be committed to a psychiatric hospital.

Bobokulova was moved from the Serbsky Centre to the psychiatric hospital at Butyrka detention facility in Moscow, following the conclusion of her psychiatric assessment, said the press service of the Moscow Department of the Federal Penitentiary Service.

Pending the psychiatric analysis, a court in Moscow this week extended her custody until 29 May.

Investigators demanded her continued detention as she sat stern-faced in a metal cage in the court room.

Confession: 'I saw how they cut off heads and I did it. The voices - I killed the girl, yes. But I don't need treatment. Let me go back to the normal jail,' Bobokulova revealed

Deranged: Bobokulova added: 'There was a voice in my head: 'Do it to the girl'. 'I feel sorry a bit for her. I feel sorry for myself. I have no home, I have nothing. She was a good girl. But I don't have a home. Hatred.'

Psychosis: But psychologists have ruled Bobokulova will not face a murder trial because she is insane and therefore is not responsible for the killing

'Bobokulova may pose a threat to society if she is released,' Judge Tereza Zhrebets was warned.

The nanny admitted to setting fire to the flat after killing the girl.

She was later detained near Oktyabrskoye Pole metro station.

Bobokulova was walking around with the girl's head in her hand, shouting 'Allahu Akbar' (Arabic for God is Great) and threatening to blow herself up.

She later confessed to the crime and was taken back to the crime scene by police.

She told one journalist: 'I saw online how they were cutting off heads. This hatred. There was a voice in my head: 'Do it to the girl'. '

She said: 'I saw how they cut off heads and I did it. The voices - I killed the girl, yes. But I don't need treatment.'

Grief: The little girl's mother Ekaterina (left) and father Vladimir Meshcheryakov (left) have been left devastated by the loss of their cherished daughter

Torched: Bobokulova, a Muslim, from Uzbekistan where the majority of the population is Muslim, set fire to the Moscow flat after she decapitated the girl

Discovery: Nastya Meshcheryakova's decapitated body was discovered in the cot by firefighters called in to tackle a fire in the flat

A Russian lawyer Lyudmila Aivar said: 'If the experts call her insane and declare that she did not control her actions, court action will still follow.

'If Bobokulova can take part, she will. If the doctors see that she reacts inadequately, the trial can go on without her.