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Police and the Investigative Committee  cars secure an area abound a subway station in Moscow on Monday, Feb. 29, 2016. Russian news agencies report that police have arrested a woman who was waving the severed head of a small child outside a Moscow subway station. The Investigative Committee released a statement saying a woman was arrested Monday on suspicion of killing a child aged 3 or 4 in an apartment near the metro station in northwestern Moscow and then setting the apartment on fire. The statement said the woman was believed to be the nanny. (AP Photo/Alexander Zemlianichenko)
Police and the Investigative Committee  cars secure an area abound a subway station in Moscow on Monday, Feb. 29, 2016. Russian news agencies report that police have arrested a woman who was waving the severed head of a small child outside a Moscow subway station. The Investigative Committee released a statement saying a woman was arrested Monday on suspicion of killing a child aged 3 or 4 in an apartment near the metro station in northwestern Moscow and then setting the apartment on fire. The statement said the woman was believed to be the nanny. (AP Photo/Alexander Zemlianichenko)

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    Woman seen waving child's severed head in Moscow

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Woman seen waving child's severed head in Moscow

A woman who carried the severed head of a child into a Moscow metro station has been arrested. CNN's Matthew Chance has more.

Woman seen waving child's severed head in Moscow

A woman who carried the severed head of a child into a Moscow metro station has been arrested. CNN's Matthew Chance has more.