The Isis executioner known as "Jihadi John" has been filmed saying he will return to Britain to continue "cutting off heads".
The terrorist, who has been in hiding since he was named as 27-year-old Londoner Mohammad Emwazi, had previously been caught on film in January.
In a one minute and 17 second video, he is seen wearing a black hood with his face uncovered for the first time on camera.
He is heard threatening to return to the UK with the leader of ISIS ("Khalifa") to kill non-Muslims ("kuffar").
The new footage, released by The Daily Mail, is believed to have been taken in south-east Syria two months ago.
The film is believed to have been secretly obtained by rebel fighters of the Free Syrian Army, who passed it to a colleague known as Abu Rashid, in the Bulgarian capital of Sofia.
An audio clip which accompanied the video includes a man with a British accent saying: "I am Mohammed Emwazi. I will soon go back to Britain with the Khalifa... We will kill the kuffar... I will carry on cutting heads."
It is the first time the former Westminster University student has been seen unmasked in any Isis footage, although pictures of him emerged during his school and student days when his identity was revealed in February this year. And it scotches previous speculation that Emwazi had fled with the extremists to Libya.
Emwazi is believed to be responsible for the beheadings of at least seven Western hostages including Britons David Haines and Alan Henning.
He was also seen in another video taking part in the execution of 17 Syrian soldiers.Reuse content