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A 15-year-old girl has been jailed after murdering her mother after becoming obsessed with ISIS and its abhorrent hostage beheading videos.

Lisa Borch was just 15 when she took a kitchen knife and killed her mum in October last year.

Minutes earlier she had been watching the beheadings of British hostages David Haines and Alan Henning on YouTube, carried out by twisted terrorist Jihadi John.

Lisa, alongside her radical boyfriend Bakhtiar Mohammed Abdulla, stabbed her mum Tina Römer Holtegaard at least 20 times at their home in Kvissel, rural Denmark.

A court heard how the teenager fell in love with a radical Muslim, but was heartbroken when he left her to go back to his family in Sweden.

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However she then met Iraqi 29-year-old Abdulla at a refugee centre near her home and fell in love, prosecutors said.

Both took part in the horrific murder, with Lisa then calling police yelling: "I heard my mother scream and I looked out the window and saw a white man running away.

"Please come here, there is blood everywhere."

Her mother's husband was away on a business trip at the time, and when police arrived they found Holtegaard covered in blood.

But when police further investigated the house, they found Tina calmly playing with her phone.

Police later examined her computer, discovering that she had been watching the sickening ISIS videos.

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At her trial prosecutors said: "She watched them the whole evening long."

Lisa's twin sister had previously moved out of the house as she had become fed up over the constant arguing between Lisa and their mum.

A court heard how it was the "endless rowing which cost the mother her life".

Lisa and her new lover plotted together to flee to Syria and fight for ISIS upon murdering her mother.

The teenager regularly argued with her mum, who wanted Lisa to break off her relationship with the 29-year-old who was almost twice her age and "live the life of a normal teenager."

Karina Skou, prosecuting, told the court: "This murder was cold blooded, ice cold and committed in a bestial manner."

Lisa even showed her twin sister the knife she said she was going to kill her mum with, but thought she was just joking.

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The teen blamed her boyfriend for the murder in court. He claimed he was only at the scene briefly because he arrived afterwards to "help Lisa".

When police got to the house he was not there, however his fingerprints were discovered in the mother's bedroom.

The court was unable to rule which of the pair delivered the fatal wounds, however they were both convicted of murder.

(Image: Getty)

Borch was sentenced to nine years, the first of which will be spent in a young offenders institution.

The following eight years will be in jail.

Her boyfriend Abdulla received 13 years, and when his sentence expires he will be expelled from Denmark.

Lisa's twin was in court to see her sentenced.