A recording purportedly showing the leader of the Islamist militant group Isis reportedly called the man "Caliph Ibrahim, emir of the faithful in the Islamic State," according to Reuters.
The man is believed to be Abu Bakr al-Baghdadi, although it was not possible to immediately confirm the identity of the man. According to the video, he said:
God has granted your brothers, the Mujahideen, victory and a conquest after years of patience and holy struggle, and enabled them to achieve their objective.
I was appointed in charge of you, though I am not the best or better than you, so if you see me in the right, then help me, and if you see me in the wrong, advise me and put me right.
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Police chief says the video can now be release without 'adversely impacting' the investigation.
The news was announced on Instagram by director Spike Lee who described him as a "dear friend" and "a great actor".
In a statement the pair said they remained "great friends" and "will continue to support each other".