The U.S.-backed Syrian Democratic Forces (SDF) has not received a request from any foreign government to hand over two British Islamic State militants in its custody, a senior SDF official said Friday.

"We have not received any official request from any international party to hand over the two prisoners," said Redur Xelil. Any such request would be studied, he added.

U.S. officials said on Thursday that the SDF, a militia force, had last month captured Alexanda Amon Kotey and El Shafee Elsheikh, two of four militants known as the "Beatles" for their English accents. They were notorious for their role in the kidnap, torture and killing of Western hostages in Syria.