Peter Dominiczak, and Christopher Hope, The Telegraph
David Cameron is expected to announce air strikes as early as next week against the Islamist “monsters” who murdered David Haines and are threatening the life of another British hostage.
Mr Haines became the first Briton to be murdered by a man believed to be the British-accented terrorist known as “Jihadi John”, who has previously beheaded two American journalists.
In the footage, released on Saturday night, the terrorists threaten to murder a second British captive – Alan Henning, a 47-year-old aid convoy volunteer from Manchester who was captured in Syria late last year.
Friends revealed on Sunday that Mr Henning had travelled to Syria to help refugees after being affected by images of their plight.
The news that a second British captive is being threatened prompted MPs and senior military figures to call for immediate UK military action against Isil.