El Shafee Elsheikh was accused of being one of four British members of the Islamic State responsible for the torture and killing of Kayla Mueller and three others.
Four recent deadly attacks have highlighted Palestinian anger over vanishing prospects of a Palestinian state, but the assailants’ diverse backgrounds have left many questions unanswered.
The State Department and the French foreign ministry said they were alarmed at reports of deaths caused by the Malian armed forces and their allies — Russian mercenaries with the Wagner Group.