Two Islamic State in Iraq and Syria (ISIS) fighters from Britain have been captured by Kurdish forces backed by U.S. forces in Syria, The New York Times reported Thursday.

The two men, part of a group of four ISIS fighters known as the "Beatles" due to their British accents are reportedly being questioned by U.S. forces in the region, a senior official confirmed to ABC News. They were known for their role in the torture and deaths of Western hostages

NEW: Two of four British ISIS members who presided over executions of western hostages were captured by Syrian Democratic Forces and are being interrogated by U.S. forces, senior official confirms to @ABC. — ABC News (@ABC) February 8, 2018

Alexanda Kotey and El Shafee Elsheikh were the last two remaining "Beatles" members still at large - Mohammed Emwazi, known as "Jihadi John," was killed in an airstrike in 2015, while another, Aine Davis, remains imprisoned in Turkey.

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In a statement to the Times, the State Department explained Kotey and Elsheikh's roles as executioners and jailers for ISIS, now on the run in Iraq and Syria.

Kotey “likely engaged in the group’s executions and exceptionally cruel torture methods, including electronic shock and waterboarding. Kotey has also acted as an ISIL recruiter and is responsible for recruiting several U.K. nationals to join the terrorist organization," the State Department said.

“Elsheikh was said to have earned a reputation for waterboarding, mock executions and crucifixions while serving as an ISIS jailer,” the statement continued.

Kotey, 34, and Elsheikh, 29, were captured by the U.S.-backed Kurdish Syrian Democratic Forces (SDF) as early as mid-January, the Times reports. The SDF turned over the suspects to American Special Operations forces, officials said, who confirmed their identities with biometric measurements including fingerprinting.