A spokesman with the US Office of the Director of National Intelligence told CNN: “We are aware of the audio tape purported to be of Abu Bakr al-Baghdadi and are taking steps to examine it. While we have no reason to doubt its authenticity, we do not have verification at this point.”

The speech seems to have been recorded relatively recently, as it references North Korean nuclear threats against Japan and the United States, as well as Syrian peace talks — in which Russia, Turkey and Iran are trying to extend ceasefires across Syria.