27 February 2015 Last updated at 00:01
Dominic Casciani, Home affairs correspondent
http://www.bbc.co.uk/news/uk-31641569
Emwazi in one of the videos in Syria which feature the killing of hostages
Mohammed Emwazi was born in Kuwait in 1988 and came to the UK in 1994 when he was six years old. He is believed to have been educated at the Quintin Kynaston Community Academy in St John's Wood, north London although that is not confirmed. He later graduated in computing from the University of Westminster in around 2009.
His final address in the UK before he went abroad was in the Queen's Park area of north-west London. Emwazi came to the attention of the security services in 2009-2010 as MI5 and other agencies monitored suspected extremists that they had linked to investigations into foreign fighters joining al-Shabab in Somalia.
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Emwazi himself was never charged with a terrorism-related offence in the UK but he was detained abroad after travelling in 2009 to Tanzania following his graduation.
Going by the name Muhammad ibn Muazzam, he had travelled with another Briton, known as "Abu Talib" and a third man, a German convert called "Omar".
Once they arrived, they were immediately denied entry by the local security services. They were interrogated and Emwazi later claimed to Cage, a campaign group in London, that they had been subject to harassment and abuse.
Questioned in Europe
Court papers naming Emwazi from 2011 - names redacted by the BBC
According to Cage, Emwazi was questioned by both Dutch and British security services as he returned home via The Netherlands. The British MI5 officer used the name "Nick". The account he gave to the campaign group includes allegations that MI5 spoke to his fiancee - and that scared her off, ending the relationship. MI5 reportedly asked him what he thought of the London suicide attacks of 2005, the war in Afghanistan and his opinion of Jews.
In September 2009, he returned to Kuwait to stay with his father's family and, according to those who met him at the time, to look for a new life in the Middle East. He had landed a good computing job and was, according to Asim Qureshi of Cage, planning to marry and settle down. He returned twice to the UK - but claimed he was ultimately prevented from returning to Kuwait in 2010 when he was held and interrogated for six hours at Heathrow. During this detention, he alleges he was assaulted by an officer.
This experience, according to Cage, changed the course of his life because he had planned to marry in Kuwait and had only returned to London to finalise wedding plans.
Cage claims that he became desperate to leave the UK and that in 2013, he changed his name by deed poll to Mohammed al-Ayan and tried once more to travel to Kuwait. But he was stopped again. His parents reported him missing in August. Four months later police are said to have told the family that he was in Syria, although the family thought he was doing aid work in Turkey. We do not know exactly when he entered the war zone but he was first reported to be in Idlib the same year, assisting in guarding Western hostages.
In August 2014, he appeared in the video which shows the murder of US journalist James Foley - and then over the subsequent months, similar films showing the killing of Steve Sotloff, David Haines and Alan Henning. In none of these videos is it clear whether it is the masked man or another person off camera who kills the victims.
But in November 2014, the same militant features in a hostage death video - and this time he appears to be carrying out the killing of a Syrian military officer. He also stands over the severed head of American Peter Abdulrahman Kassig. Two months later he appears in another video in which he kills the Japanese hostage, Kenji Goto.
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He did not deliver.
That is a shortest way to past life, if any.
IZAKOVIC