The FBI has identified the British Islamic State extremist who beheaded three hostages.
FBI director James Comey confirmed the force has uncovered the identity of the killer, who was previously only known as “Jihadi John”.
But he refused to give the man’s name publicly.
It comes after MPs unanimously backed UK airstrikes against IS in Iraq.
This evening Downing Street released the wording of the motion that will be put before the Commons tomorrow, along with a summary of the legal justification for the intervention.
The motion text states that troops will not be deployed in "ground combat operations" against IS - also known as Isil (Islamic State of Iraq and Levant).
It also makes clear that another vote will be called if the campaign is to be extended to Syria.
The legal summary argues that the action is permissible because Iraq has requested military help to protect its "people and territory".
Earlier this week Foreign Secretary Philip Hammond said UK and US intelligence services were "getting warm" in the hunt for the jihadi with a London accent, who has so far featured in videos showing the murder of American journalists James Foley, 40, and Steven Sotloff, 31, as well as British aid worker, David Haines, 44.
The man is said to lead a small group of British jihadis who became known by hostages as "The Beatles".
