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Detectives are investigating a schoolgirl after a shocking video showing her fighting with a boy emerged and other other pupils claimed she has male classmates 'living in fear'.

The teenager, named only as Anna, is reportedly a new girl at School 1557 in Zelenograd, just outside Moscow.

Anna has allegedly acted aggressively and repeatedly attacked other pupils ever since she starting the school a few weeks ago.

Fellow pupils say they have lodged complaints about her violent behaviour but school administrators deny receiving them, according to local media.

(Image: CEN)

Police are now investigating after a video of Anna, whose exact age was not reported, fighting one boy was posted on social media.

The footage, taken by another pupil with a smartphone, shows her taking on and beating the boy even though he is bigger than her.

The boy is seen trying to grab Anna, wearing trainers, jeans and a black T-shirt, by the legs and wrestle her to the floor.

But he ends up clinging on in desperation as the teen delivers a series of forceful blows with her fists and feet.

(Image: CEN)

At one point, she steps back and aims a karate kick at the boy's face.

After the footage was posted online, several viewers commented on the shocking behaviour.

Andrey Dekailo said: "Her parents should be penalised with fines, and the girl should get properly lectured by the school headmaster.

"If that doesn't work then the juvenile department of the local police office. She should be on their watch and sent to a colony if she throws more tantrums like that."