LONDON—The mother of one of the British Islamic State militants suspected of murdering western hostages, lost a legal challenge Jan. 18 that it was wrong for Britain to assist a U.S. investigation which could lead to them facing the death penalty.
Britons El Shafee Elsheikh and Alexanda Kotey—two of a notorious group of British fighters nicknamed “The Beatles”—are being held by Kurdish militia after being captured in Syria last year.
