A 21-year-old woman who was believed to be a British medical student before fleeing to join the ISIS in Syria has posted an image on Twitter of herself holding a severed head, The Sunday Telegraph reported.

In the image, which was used as her profile picture and has since been taken down by the site, she can be seen wearing a white medical coat on top of a full burka while clearly holding up the severed head as children look on from the background. It was captioned "Dream job, terrorist doc," followed by images of smiley faces and love hearts. 

The woman, who goes by the Twitter name of Mujahidah Bint Usama, claims to be a doctor for the terror group based in Raqqa, Syria. The Jihadist pseudonym seems to reflect her convictions, "Mujahidah" meaning "female soldier of God", Bint translating as "child of", and Usama most likely a reference to Osama bin Laden, according to UK MailOnline.

Her Twitter account, which has now been suspended, was used to share images of the 9/11 attacks and dead soldiers, along with more mundane, practical information on how to treat insomnia and an injured knee, according to Breitbart.

"Running away from Jihād will not save you from death. You can die as a coward or you can die as a martyr," the description of her Twitter account read, which was being followed by 800 people.

Bint Usama, one of an increasingly high number of British Muslim women travelling to Syria to help the self-proclaimed Islamic State, is most probably being granted senior positions in the so-called Al-Khanssaa brigade, which exists to force a strict interpretation of Islamic law on women in the city of Raqqa.

"Last week, Breitbart London reported how some of these women are also running 'brothels' where captured Yazidi women are kept as sex slaves for jihadi men," according to Breitbart. "It is estimated that up to 3,000 Yazidi women have been captured by ISIS."

Meanwhile, the UK government, known to be monitoring the accounts of around 60 female British jihadis aged between 18 and 24, has stated recently that those who take part in atrocities such as beheadings and massacres will be prosecuted for war crimes and terror offences if they decide to return back.

It is believed hostages Steven Sotloff, James Foley and David Haines were beheaded in the desert near Raqqa, meaning that the British women in al-Khanssaa could know who the perpetrators are.