FBI Director Christopher Wray told Congress today that the FBI is “not giving up” on bringing two British-raised ISIS terrorists, known colloquially as “The Beatles,” to the U.S. for prosecution.

El Shafee Elsheikh and Alexanda Kotey, who are currently being held prisoner in Syria by the U.S.-allied Syrian Democratic Forces, were part of an ISIS terrorist cell believed to be responsible for the beheadings of American journalists James Foley and Steven Sotloff, American humanitarian aid worker Peter Kassig, British humanitarian aid workers David Haines and Alan Henning, and numerous other hostages.