Several current and former government officials said they believed an American — 28-year-old Adam Gadahn — may have written at least part of the speech.
Gadahn, who has been charged with treason and supporting terrorism for serving as an al-Qaida propagandist, has appeared in several past al-Qaida-produced videos, lecturing against capitalism and globalization and making insider references to American culture.
"It has Adam Gadahn written all over it," one former senior intelligence official said of bin Laden's tape, speaking on condition of anonymity because of the sensitivity of the issue.
In the new video, bin Laden derided President Bush, saying events in Iraq have gotten "out of control" and the American leader "is like the one who plows and sows the sea: He harvests nothing but failure