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The elite military unit has been ordered to take down Abu Bakr al-Baghdadi in a “kill not capture mission”.

Defence chiefs in both Britain and the US believe eliminating the ISIS leader is the best chance of defeating the terror cell for good.

They hope that by cutting off the head the body will die, in a similar way to al-Qaeda, which has never fully recovered from the death of leader Abu Musab al-Zarqawi in 2006.

MI6 and GCHQ are now putting all resources into tracking down and killing al-Baghdadi.