http://www.jamestown.org/terrorism/news/article.php?articleid=2369843
Paul Tumelty
"The release of a videotape featuring July 7 bomber Mohammed Siddique Khan's message to the world, cleverly interspersed with Ayman al-Zawahiri, has led many to suspect al-Qaeda's controlling hand. Yet the most credible leads continue to point to a self-starter cell of dedicated young British Muslims motivated by injustice [1]."