They were the last two members of the brutal "Beatles" group of four British militants to remain at large. Some of their victims included the British aid worker, David Haines and US journalist, James Foley both beheaded in 2014.
Syrian Kurdish fighters have captured the last two fugitives of the so-called Islamic State's "Beatles" cell, which was notorious for beheading Western hostages on camera, The New York Times and BBC reported Thursday, citing anonymous American officials.
Ringleader Emwazi was killed in a drone strike in 2015 and Davis is in jail in Turkey after being convicted on terrorism charges.
David Haines was a British aid worker abducted in Atmeh, Syria in March 2013. The father of two took unpaid leave from work to volunteer.
Former hostages describe severe mistreatment, beatings and mock executions at the hands of their jailers, especially the Britons.
The Islamic State's group self-declared caliphate - its area of control - shrunk rapidly previous year.
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USA partner forces in Syria are holding two suspected Islamic State militants believed to be the remaining members of a cell that held and, in some cases, executed Western hostages, US officials said Thursday.
It is unclear if the Justice Department will prosecute the two men or when they will be turned over to the US military, the Times reported. He was the masked militant who featured in gruesome IS videos, taunting Western powers before beheading hostages. Both men previously lived in London, and are considered foreign terrorists by the US State Department. The fluent Arabic speaker left for Syria in April 2012.
Kotey, who has a Ghanaian and Greek Cypriot background, also grew up in West London.
"Kotey has also acted as an ISIL (IS) recruiter and is responsible for recruiting several United Kingdom nationals to join the terrorist organization".
U.S. security services said Mr Kotey was responsible for recruiting several volunteers for Isis while Mr Elsheikh earned a reputation for carrying out mock executions and water boarding.