According to reports, the jihadi is scared that the publicity surrounding him, and the revelations about his true identity, make him a target for other Islamic State killers, who he fears are plotting against him.
A source told the British press that the jihadi is aware that the Islamic State would drop him "like a stone or worse if they feel he is no longer of any use to them."
"So it is possible he will end up suffering the same fate as his victims."
The killer is now said to have joined another, less well-known jihadi group in Syria, which would also enable him to keep a lower profile and avoid detection by British and US Special Forces operating in Iraq and Syria. Last month his destination was reported to be Libya, where he was seeking to avoid capture.
#AfricaTweet To Libya's youth $12 million reward if you kill or arrest Mohammed Emwazi aka #JihadiJohn of daech Sirte pic.twitter.com/PaUtAuFIhy
— Heyoka;╪ͥͥͥͥͥͥͥͥͥͥͥ (@knightcali) 28 июня 2015
Emwazi is the latest infamous British-born jihadi thought to to have become disillusioned with life in the Islamic State in recent weeks. In early July it was reported Abdel-Majed Abdel Bary, 24, who also performed as a rapper in London under the name L. Jinny and was earlier thought to have been the real identity behind 'Jihadi John,' had disguised himself as a refugee in order to go into hiding in the border zone between Turkey and Syria.
Abdel-Majed Abdel Bary is one of dozens of former jihadis on the run from their former comrades in the Islamic State as well as from the authorities in the countries they grew up in, where they are threatened with a custodial sentence if they return.
In February Imran Khawaja, 27, from west London, was jailed for 12 years for terrorism offences committed in Syria. Khawaja was arrested in Dover in June last year after attempts to fake his own death failed to conceal his entry from the authorities.