
Abu Bakr al-Baghdadi announced the establishment of an Islamic caliphate in 2014.
But the Islamic State of Iraq and the Levant (ISIL or ISIS) group chief maintained a low profile in recent years with few audio recordings.
ISIL still has reserves of wealth estimated at $300 million.
Al Jazeera's Osama Bin Javaid reports live from Hatay, Turkey.
Al Jazeera's Natasha Ghoneim reports live from Mosul, Iraq.