Family Members of Islamic State Leader Detained Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email An image grab taken from a video released on July 5, 2014 by Al-Furqan Media shows ISIS leader Abu Bakr al-Baghdadi preaching during Friday prayer at a mosque in Mosul. ( Al-Furqan Media/Anadolu Agency / Getty ) Produced by PRI and WNYC