"Secret Al Qaeda" = Phony Al Qaeda?

According to MSNBC Arab translator Jacob Keryakes, the website claiming responsibility for the London terror bombings in the name of "The Secret Organization of Al Qaeda in Europe" may be a fake.

Specifically, Keryakes refers to a Quaranic error in the statement that argues against the legitimacy of the authors' affiliation with the terror network.

Amy Robach: Jacob, where did the statement originally appear?

Jacob Keryakes: Well, the statement was published on an Islamic web site.  Minutes later, it was removed from the web site itself because it contained an error in one of the Quaranic verses and al-Qaida doesn't usually do that, but the same statement was published (later) on a secular web site.

If not Al Qaeda, then who?  Surely there are plenty of malcontented Al Qaeda wannabes roaming the planet.  But could an unaffiliated group of evildoers pull off such a coordinated attack, one of the most severe episodes of terrorism since 9/11, and the worst attack on London since World War II?