“Jihadi John” and “Jailer John” are believed to be pseudonyms for Mohammed Emwazi, a member of the Islamic State of Iraq and the Levant, known for beheading several hostages in 2014 and 2015. The masked Islamic State militant known as “Jihadi John”, who has been pictured in the videos of the beheadings of Western hostages, has been named. He is Mohammed Emwazi, a Kuwaiti-born British man in his mid-20s from west London, who was previously known to British security services. British police declined to comment, citing ongoing investigations. Emwazi first appeared in a video last August, when he apparently killed the US journalist James Foley. Dragana Haines, wife of slain hostage David: “I hope he will be caught alive… He needs to be put to just...