An ISIS supporter has posted a sickening video online showing a young girl singing a disturbing song about destroying the enemies of the terror group before she beheads a doll.

The youngster, who wears a black niqab, appears in the footage brandishing a large knife in front of the camera.

She then begins to sing a song in Arabic in her high-pitched voice, where she warns 'my sword has been sharpened and I will destroy you.'

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A new video released by ISIS shows a young girl dressed in a niqab brandishing a knife and threatening enemies of the terror group

The youngster then grabs a doll and proceeds to cut the head off the toy while saying 'I will destroy you'

The little girl then continues to sing the haunting tune before grabbing hold of the doll and lying it on the floor.

She then proceeds to hack at the toy with her knife until its head has been chopped off, before she proudly shows it to the camera and drops it on the floor.

The little girl shouts: 'We marched through the night to cut and behead.'

Soon afterwards the doll is left lying on the floor with its head cut off after it was hacked at by the young girl

The little girl proudly displays the head of the doll in front of the camera before dropping it on the floor

Afterwards she punches her fist in the air, as if to celebrate shuouting Allahu Akbar, before adding: 'With sport of night, young men of terror.. The Islamic State will remain and expand.'

The clip came to light after it was posted on an ISIS Telegram account before being picked up by the Middle East Media Research Institute.

And it prompted outrage online with people describing the clip as 'very disturbing' and likened the young girl 'to something out of a horror movie.'

Afterwards she punches her fist in the air, as if to celebrate shuouting Allahu Akbar

The disturbing footage comes as Iraqi forces prepare to attack ISIS militants in its de-facto capital of Mosul in Iraq.

The Iraqi army and its elite units that will lead the offensive are gradually taking up positions around the city, from whose Grand Mosque ISIS leader Abu Bakr al-Baghdadi declared a caliphate spanning regions of Iraq and Syria in 2014.