A masked, black-clad militant, who has been identified by the Washington Post newspaper as a Briton named Mohammed Emwazi, stands next to a man purported to be Kenji Goto in this still image from a video obtained from SITE Intel Group website February 26, 2015. REUTERS A masked, black-clad militant, who has been identified by the Washington Post newspaper as a Briton named Mohammed Emwazi, stands next to a man purported to be Kenji Goto in this still image from a video obtained from SITE Intel Group website February 26, 2015. REUTERS