The latest recorded message from the terrorist network Al-Qaeda features deputy chief Ayman al-Zawahiri and an American member of the group urging Americans to convert to Islam.
In excerpts aired by the US-based CNN, the tape titled Invitation to Islam shows separate clips of Zawahiri and an English-speaker introduced as Azzam the American.
CNN identified him as Adam Gadahn, a native Californian wanted by US authorities. He has appeared in previous Al-Qaeda videos.
"We invite all Americans and believers to Islam, whatever their role and status in Bush and Blair's world order," Gadahn said in the tape. "Decide today, because today could be your last day," it added.