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A British schoolgirl who ran away from her East London home with two school friends to join Islamic State has married a terrorist dubbed the 'Ginger Jihadist'.

Sixteen-year-old Amira Abase left the UK earlier this year and travelled through Turkey before crossing the Syrian border to connect with ISIS fighters.

She has now married Australian extremist Abdullah Elmir, 18, who last year warned Islamic State won't stop their campaign of hatred and violence until 'the black flag is flying over Buckingham Palace'.

(Image: PA / Reuters)

The teenager from Sydney, who calls himself Abu Khaled, achieved worldwide notoriety when he appeared in a disturbing ISIS propaganda video glorifying attacks against non-Muslims.

Elmir, nicknamed the 'Ginger Jihadist' due to his distinctive red hair, contacted the Mail on Sunday to confirm he had married British teenager Abase.

He warned them not try to contact her.

He boasted about imminent attack on the UK, saying: "This is a direct threat. Brothers that I know there ... are itching to do an attack."

The fanatic also sent sickening congratulations to Seifeddine Rezgui, who gunned down 38 people in last month's terrorist attack in Tunisian holiday resort Sousse.

(Image: Met Police)

He added: "On the Tunisia attacks, may Allah bless the man who slaughtered those filthy kuffar (infidels)."

Elmir famously fronted an ISIS video that threatened the coalition counties with attacks on their own soil.

In the footage, released last year, he said: "We will not put down our weapons until we reach yours lands, until we take the head of every tyrant, and until the black flag is flying high in every single land - until we put the black flag on top of Buckingham Palace, until we put the black flag on top of the White House, we will not stop and we will keep on fighting."