An extremist Islamist group with a 'big UK support base' has joined forces with al-Qaeda in Syria, according to reports.

Hizb ut-Tahrir (HT) has reportedly attacked civil activists in Aleppo alongside local al-Qaeda franchise Nusra Front, the Times has revealed.

Several British men linked to ISIS, including Mohammed 'Jihadi John' Emwazi, are known to have been in contact with the group while studying at UK universities.

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