A blonde Danish teenager who murdered her mother after watching ISIS' sickening filmed beheadings of British hostages has been jailed along with her older jihadi lover.

Lisa Borch was aged only 15 when in October last year she spent hours on YouTube watching footage of the savage decapitations of David Haines and Alan Henning.

Afterwards she and her radical Muslim boyfriend Bakhtiar Mohammed Abdulla, 29, took a long-bladed kitchen knife and stabbed her mother Tina Römer Holtegaard at least 20 times at the home they shared in rural Kvissel.

Killer: Danish teenager Lisa Borch (pictured left and right) was aged only 15 when in October last year she spent hours on YouTube watching footage of the savage decapitations of David Haines and Alan Henning

Tina Römer Holtegaard was stabbed at least 20 times at the home she shared with her daughter in Kvissel

A court which sentenced Borch to nine years in jail heard how she became obsessed with militant Islam after falling in love with an unnamed Muslim man.

But he jilted her when he moved back to Sweden to be with his wife and children.

Nevertheless she found a new soulmate in Iraq-born Abdulla, whom she befriended after meeting at a refugee centre near her home.

Following the brutal murder, in which both Borch and Abdulla participated, the teenager called police claiming: '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.'

On arrival police found Mrs Holtegaard, whose husband was away on a short business trip at the time of her murder, covered in her own blood in bed.

Despite making the frantic phone call, the victim's daughter was discovered sitting on a chair in the living room playing with her iPhone and watching videos on YouTube. When police asked where her mother was, Borch refused to leave her computer and simply pointed upstairs.

Lisa Borch and her radical Muslim, Iraqi-born boyfriend Bakhtiar Mohammed Abdulla, 29, (pictured left and right) took a long-bladed kitchen knife and stabbed her mother Tina Römer Holtegaard at least 20 times

Influenced: A court which sentenced Borch to nine years in jail heard how she became obsessed with militant Islam after falling in love with an unnamed Muslim man. She later met Bakhtiar Mohammed Abdulla

A later police examination of the computer showed that she had watched endless repeats of the beheadings of the two Britons, both of whom had gone to Syria on humanitarian missions.

Brainwashed: The court heard how Borch (pictured) became obsessed with militant Islam after falling in love with a unnamed Muslim

'She watched them the whole evening long,' said prosecutors at her trial. When police first arrived at the house she didn't leave the computer and merely pointed upstairs to indicate where her mother lay dead. It was this apparent disinterest which made her prime suspect in a matter of minutes.

The court heard that Borch's twin sister had recently moved out of the family home because she couldn't stand the constant arguing that went on between her mother and sister.

Prosecutors said it was this 'endless rowing which cost the mother her life.'

The court was told that Borch had teamed up with Abdulla after being dumped by her first lover. The two planned to flee together to Syria and fight for the ISIS cause.

Borch claimed at the trial that they were 'just good friends' but authorities believe they were lovers.

The rows with her mother intensified as she pressured her daughter to break off her relationship with him and 'live the life of a normal teenager.'

Prosecutor Karina Skou told the court that the pair made a diabolical pact to kill her mother saying: 'This murder was cold blooded, ice cold and committed in a bestial manner.'

Borch even showed her twin sister the knife she planned to use to kill their mother, but the comment was incorrectly written off a macabre joke.

A police examination of Borch's computer showed that the teenager had watched endless repeats of the beheadings carried out by Mohammed Emwazi - the British ISIS executioner better known as Jihadi John

Borch and her radical Muslim boyfriend Bakhtiar Mohammed Abdulla, 29, took a long-bladed kitchen knife and stabbed Tina Römer Holtegaard at least 20 times at the home they shared in rural Kvissel [file image]

In court Borch and Abdulla blamed one another for the killing of Mrs Holtegaard.

He claimed to have only arrived to 'help Lisa' after the teenager had already killed her mother. But Borch said Abdulla had actually been the knifeman.

The muddled version of events meant the court heard several stories about what actually happened.

Although Abdulla was no longer at the property when police arrived, investigators found his fingerprints in the victim's bedroom.

Although it couldn't be established who'd actually delivered the blows that killed Mrs Holtegaard, both of the accused were found guilty of murder.

Borch was sentenced to nine years in prison, the first of which will be spent in a youth offenders institute.

Abdulla received 13 years and will be expelled from Denmark when his sentence is up.

Both were ordered to pay around £40,000 in compensation to Mrs. Holtergaard's husband - Borch's stepfather - as well as her twin sister and a younger brother.