Kotey, 34, and Elsheikh, 29, were detained by Syrian Kurdish fighters, according to United States officials cited anonymously by the New York Times. The men were the last at-large members of a group of ISIS fighters from the United Kingdom dubbed "The Beatles" for their conspicuous British accents.
Diane Foley, who son James, an American journalist was beheaded in August 2014, said she would like Kotey and Elsheikh to face trial in America, adding: "Their crimes are beyond imagination".
The group's fourth member, Aine Davis, was convicted on terror charges previous year in Turkey.
A security source confirmed to i that the pair, who had both lived for most of their lives in west London before parting for Syria, were stripped of their British citizenship by the Home Office at some point between mid-2016 and early 2017. The group was known for torture and execution, including the beheading of western hostages. It said the British militant was "said to have earned a reputation for waterboarding, mock executions, and crucifixions while serving as an [IS] jailer".
It was not clear whether the Justice Department would prosecute the two men or when the U.S. military would take custody of them. ISIS said she was killed in a bombing raid. "I didn't know what to feel, I didn't know what to think and then you kind of realise it's real and you think that's it, they're gone, they can't hurt anyone else".
The defense official told Fox News that Kotey and El-Sheikh "are believed to have acted as guards and interpreters involved in ISIS' illegal captivity of Western hostages".More news: Black Panther Gets Second Rotten Review
Senior SDF official Redur Xelil told Reuters that Kotey was captured in a rural area of Raqqa province on January 24. USA law enforcement officials wanted to prosecute Umm Sayyaf in Virginia, but she was turned over to the Iraqi government instead.
Journalist Nicolas Henin says the two men should be tried in Britain, not shipped to Guantanamo Bay, because revenge will just breed more violence.
"We are looking to exploit real-time intelligence".
The US official did not give any information on the condition of the two or what would happen to them.
Its fall led to the collapse of IS in Syria, as the last remnants of the once powerful militia fought on in a slither of land along the Euphrates River or fled to Turkey or other parts of Syria. Counterterrorism officials believe ISIS leader Abu Bakr al-Baghdadi remains at large, despite rumors of his death.
This Oct. 19, 2017, image from drone video, shows damaged buildings in Raqqa, Syria, two days after Syrian Democratic Forces said military operations to oust the Islamic State group ended.