Here are some quotes from the above link:
(Lafayette Hill, Pennsylvania - 01/04/07) - Philip J. Berg, Esquire, [Berg is a former Deputy Attorney General of Pennsylvania; former candidate for Governor and U.S. Senate; an attorney with offices in Montgomery County, PA and an active practice in Philadelphia, PA, who prior hereto has filed a RICO lawsuit against Bush and others for the events of 9/11 and plans to re-file shortly] announced today that he was issuing a call for world leaders to arrest and try Bush and Cheney for the global crimes of 9/11/01.
Philip J. Berg, Esquire stated in a letter to the nations throughout the world:
"It is time for the nations of the world to come forth and take the leadership because of the failure of the United States Government and the States where crimes were committed on 09/11/01, where no thorough investigation and indictments occurred, to investigate, arrest and prosecute the people responsible for the murders on 9/11/01, specifically including George W. Bush and Richard Cheney."
I do not have primary source documentation, but the above information seems pretty credible.