Paula and Ed Kassig, the parents of Peter Kassig, a U.S. aid worker who was beheaded by Islamic State (IS) militants, and Carl and Marsha Mueller, parents of Kayla Mueller who was killed by Islamic State militants, gather outside of the Federal Courthouse following the sentencing of El Shafee Elsheikh, a former British citizen and IS fighter, in Alexandria, Virginia, U.S., August 19, 2022. REUTERS/Sarah Silbiger