Russian police have arrested a woman on suspicion of murdering a child after she was found apparently carrying a severed head.
The woman, believed to be the victim's nanny, is suspected of killing the child before setting fire to its parents' apartment, the BBC is reporting.
She was arrested in the Russian capital Moscow by police.
CCTV appears to show the woman, dressed in a hijab, walking near a metro station with a head in her hands.
A police officer intercepts and wrestles her to the ground.
She was filmed walking around and shouting "I am a terrorist" and the Islamic phrase "Allahu Akbar" (God is Great) outside the Oktyabrskoye Pole metro station.
Local media reports she took the severed head from her bag when she was stopped by a police officer.
Earlier on Monday, police found a headless girl's body in an apartment after the fire.
The suspect has been named as Gyulchekhra Bobokulova, 39, from Uzbekistan.
Russia's Interior Ministry released a statement saying they believed the head belonged to a four-year-old girl the woman had been babysitting.
A criminal investigation was launched after the discovery of the remains of a child aged three to four, whose body bore traces of a violent death, in a charred flat on Narodnoye Opolcheniye Street in north-western Moscow, it added.
The suspect is believed to have waited until the parents and an older child left the apartment before killing the girl and removing her head. She then set the apartment on fire.
She is now undergoing psychiatric testing to see if she was mentally sound and understood the significance of the crime they say she committed.
"According to preliminary information, the child's nanny, a citizen of one of the Central Asian states born in 1977, waited for the parents and elder child to leave the flat and then, for reasons not established, murdered the infant, set fire to the flat and left the scene," a statement said.