NEW YORK (AP) – The Islamic State group has acknowledged the death of the masked militant known as “Jihadi John,” who appeared in several videos depicting the beheadings of Western hostages ...

Jihadi John, who was recently unmasked as 26-year-old Londoner Mohammed Emwazi, was last seen in a video posted online which appeared to show Japanese hostage Kenji Goto lying dead.

British Prime Minister David Cameron defended the U.K.’s security services following revelations that the masked Islamic State militant known as Jihadi John was known to authorities for years.