The spark that elevated the video from the Internet's backwater appears to have been provided by Morris Sadek, an Egyptian-American Coptic activist living in the Washington, D.C., area. Mr. Sadek has been an outspoken anti-Islamic activist in the U.S., where he runs a small group called the National American Coptic Assembly.
On Sept. 6, Mr. Sadek sent an email to journalists around the world promoting a Sept. 11 event held by Rev. Terry Jones, the Florida pastor who previously sparked deadly protests by burning a copy of the Quran. In the email, Mr. Sadek included a link to the 14-minute YouTube clip.
In Egypt, journalists translated some of the footage into Arabic and broadcast it.
—Matt Bradley, Erica E. Phillips and Tamara Audi contributed to this article.
Write to Dion Nissenbaum at
dion.nissenbaum@wsj.com