Kotey and Elsheikh were the last two of "the Beatles" still at large.
The other two members of the terror group known as the Beatles were Mohammed Emwazi aka Jihadi John, who was killed in a USA airstrike in 2015, and Aine Davis who was captured in 2015 and convicted of terrorism charges in Turkey a year ago.
Aine Davis, the fourth member, was convicted of terrorism charges in Turkey. All four once lived in West London.
Why are they nicknamed 'The Beatles?'
A USA official told the NY Times that the Syrian Democratic Forces (SDF) captured the two in early January in eastern Syria and handed them over to us authorities in the country. The two men were captured in early January, and U.S. forces were given access to them, one of the officials told the news agency.
That victory was the doom of the jihadist proto-state, the last pockets of which were then retaken within weeks by the SDF and other forces in Iraq and Syria.
The group of four British men were radicalised in the United Kingdom before travelling to Syria, where they became infamous for their high-profile executions of Western hostages. Among them: American journalists James Foley and Steven Sotloff, and American aid worker Peter Kassig.
There is some question about what will happen with Elsheikh and Kotey.
USA officials said the Beatles execution cell beheaded at least 27 hostages and tortured many more.
In February 2016, BuzzFeed News unmasked Kotey as a "quiet and humble" thirty-four-year-old football fan from west London.
U.S. officials reported that El Shafee Elsheikh was thought to be part of the terrorist organisation's brutal executions gang known as "the Beatles".
The half Ghanaian, half Greek Cypriot came from a family of dress cutters in Shepherd's Bush and is believed to have converted to Islam, grown a beard, and begun dressing in traditional robes in his early twenties, after falling in love with a Muslim woman.
Elsheikh arrived in Britain as a child when his communist-supporting parents fled Sudan.
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