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The chilling threat came in a statement from ISIS' new spokesman who was appointed after the death, last August, of Abu Muhammad al-Adnani.

The group’s new spokesman, Abu Hassan al-Muhajir, announced in his first official message that countries participating in the military campaign against ISIS - including the UK - would be targeted.

His message, titled ‘For You Will Remember What I Tell You’, bizarrely claims the US, Russia, Europe and Iran are seeking to destroy Muslims.

Iran is an Islamic Republic but it is dominated by the Shia sect, which is hated by ISIS which is majority Sunni.