Then , black vehicles with blacked-out windows pulled up out front of the mosque , she said . Video refers to speaker as al - Khalifah Ibrahim , a name he goes by with followers . Iraq and U.S. officials say they are looking into the video . Group says it 's changing its name from Islamic State of Iraq and Syria to ` ` Islamic State '' Very little is known about Abu Bakr al - Baghdadi , the leader of the so - called Islamic State .
Video refers to speaker as al - Khalifah Ibrahim , a name he goes by with followers . Iraq and U.S. officials say they are looking into the video . Group says it 's changing its name from Islamic State of Iraq and Syria to ` ` Islamic State '' Very little is known about Abu Bakr al - Baghdadi , the leader of the so - called Islamic State .