Sources as disparate as PressTV from Iran and a Tweet from New York Times reporter Nicholas Kristoff as well as direct contacts that I have made in Bahrain seem to support the claim that the crackdown in the Pearl Roundabout was directly aided by military forces from Saudi Arabia.
The underlying issue is obvious enough. The most unstable regime of all in the Middle East is the Saudi Monarchy which maintains absolute rule over more than 25 million people and sits on the extraordinary wealth of the worlds largest oil reserves.
There is no where to hide for the US ruling class in these matters. The ultimate source of military power for these regimes is the US.