Here is part of that warning from MEMRI:
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On March 10, 2006, the Global Islamic Media Front (GIMF) posted, on the Islamic websites, a final warning to the American people, on behalf of “Rakan Ben Williams” who defines himself as “Al-Qaeda under cover soldier, USA [sic].”
It is not clear exactly who is behind this name. Moreover, according to a previous statement by GIMF public relations bureau director Saif Al-Din Al-Kinani on the GIMF Internet newscast Sout Al-Khilafa, GIMF is not affiliated with Al-Qaeda. 
But on November 8, 2005, the London daily Al-Sharq Al-Awsat reported: “The Global Islamic Media Front has threatened [the West] on the Internet by means of its new soldier, whom it calls Rakan Ben Williams, and whom it claims is a white Englishman who converted to Islam.” 
Also, on November 24, 2005, the GIMF posted on the Islamic websites a similar warning, under the same name, that included an explicit threat to assassinate Italian Prime Minister Silvio Berlusconi, Australian Prime Minister John Howard, Japanese Prime Minister Junichiro Koizumi, British Prime Minister Tony Blair, and U.S. President George W. Bush, when the time comes, with a clear mention of the possibility of doing so after they complete their current terms of office. Although this communiqué was directed to these leaders, it noted that it referred to all Western leaders, and included special mention of Berlusconi. At its conclusion, the communiqué said that it had been written by “the one who thirsts for the blood of the Crusaders, the secret soldier of Al-Qaeda, Rakan Ben Williams, Italy (the Vatican).” 
Internet Hananah is not so impressed with the new warning from Ben Williams:
Jihadi super hero ‘Rakan ben Williams’, most recently observed claiming to have infiltrated the Vatican, has resurfaced, now threatening attacks in the USA “far away from Washington DC”.
The first communique from ‘Williams’ was a thing of beauty, if such a term can be used in this context. Some analysts were brought close to tears by the quality of the prose, reminiscent as it was of the works of the now allegedly deceased Lewis Atiyatullah. Here, in ‘ben Williams’, was a quality sorely lacking in the global jihad of late: someone who could at least write well in Arabic.
The quality of the product has since declined. The claim to have infiltrated the Vatican was laughable and the current rhetoric is largely derivative of the conspiracy theory websites of the far-right and far-left in the United States.
In the event that we encounter Raken ben Williams here, far from Washington DC, we will of course call 911.
And this also came out on Friday, and was previously posted:
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As basketball fans ready themselves for March Madness, the FBI has warned stadium owners of possible suicide attacks:
In a directive issued today, obtained by ABC News, the FBI says a posting on an extremist message board “advocated suicide attacks against sporting events as a cost-effective means of killing thousands of Americans.”
The FBI says the Internet posting said the suicide attacks would be justified because the United States refused a truce offered by Osama bin Laden in his last videotaped statement, Jan. 19, 2006.
According to the FBI bulletin, the author of the posting recommended using “three to five blond or black American Muslim suicide bombers.” The FBI says the author suggested homemade explosives be hidden under their winter clothing.
The posting recommended, according to the FBI, that one suicide bomber detonate inside the stadium and the others detonate at exit gates as spectators were fleeing.
“The combined explosions would create a panic that would kill far more spectators than the bombing alone,” the FBI quotes the message as saying.
The FBI says it is unaware of any specific or credible plans to attack any sporting event but notes that terrorist groups have mounted attacks against sporting events in the past.