Jihad Watch has an interesting blog about the "undercover soldier" of Islam.
"Al-Qaeda Undercover Soldier, U.S.A." warns that America will be brought to its knees
Threats and Murder Update from MEMRI, with thanks to Suzie:
Purported "Al-Qaeda Undercover Soldier, U.S.A": Last Warning to American People - Two Operations Will Occur; Your Homeland Security Agency Must Surrender; States Far Away From Washington, D.C. Such as Arizona Will Be Hit; We Await Orders From Our Commander Osama Bin Laden; America Will Be Brought to its Knees
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)." 
In the following warning, Rakan Ben Williams warns that, unlike after the 9/11, Madrid, and London attacks, which are still being investigated, "[after] the coming attack there will be no one to analyze and investigate, because the mind and the heart will be unable to comprehend it… This will not be a single operation", the report added, "but two; one bigger than the other, but we will begin with the big one and postpone the bigger one, in order to see [how] diligent the American people is [in preserving] its life. If it chooses life, [it must] carry out the demands of the Muslims, and if it chooses death, then we are its best perpetrators." The warning appeared in Arabic and in English.
At the MEMRI link are excerpts from the original.
THIS ARTICAL ALONG WITH THE FOLLOWING COURTESY OF MICHELLE MALKIN:
SPORTS STADIUM TERROR ALERT
By Michelle Malkin · March 10, 2006 11:30 PM
If you're an NCAA basketball fan, heads up. This in via AP:
The FBI said Friday there is no specific, credible threat of a terror attack aimed at college basketball arenas or other sports stadiums, but acknowledged alerting law enforcement to a recent Internet posting discussing such attacks.
The FBI and Homeland Security Department distributed an intelligence bulletin Friday to state and local law enforcement nationwide describing the online threat against sporting venues, said Special Agent Richard Kolko, an FBI spokesman in Washington.
"We have absolutely no credible intelligence or threats pertaining to this issue," Kolko said.
With conference tournaments taking place this weekend, and the NCAA tournament scheduled to begin next week, the bulletin was sent "out of an abundance of caution," Kolko said.
"We have been in touch with Homeland Security and the FBI about this issue," said NCAA spokesman Erik Christiansen.
"We do not believe there is an imminent threat," he said. "We are in constant communication with the local, state and federal law enforcement agencies, including Homeland Security and the FBI. This is not new; we are in regular contact with all these law enforcement agencies at every level."
The online message described a potential attack in some detail, calling it an efficient way to kill thousands of people using suicide bombers armed with explosives hidden beneath their winter clothing, said a federal law enforcement official who read the bulletin.
But the government document also said U.S. intelligence sources could not corroborate the information or say whether the site was linked to al-Qaida.
Christiansen said, "There was no mention of a specific event or organization."
CNN has more details:
According to law enforcement sources, the Web posting advises would-be bombers to hide explosives under winter clothing, and suggests that one suicide bomber detonate a bomb inside a stadium while others detonate bombs where fans are running.
The information also suggests using "blonde or black American suicide bombers," the sources said.
Agents recommended that stadium operators review security procedures and that local law enforcement keep an eye out for suspicious activities.
Yeah, but just don't do anything about suspicious activities--you'll have CAIR suing you faster than you can yell "Islamophobe."
ARE THESE ISLAMOFACIST FOR REAL? WHAT ARE THEY NUTS. AMERICA HAS ITS INTERNAL PROBLEMS AND STIFE. HOWEVER TO WIN OVER THE MINDS AND HEARTS OF AMERICA ATTACKING INNOCENTS AT SPORTING EVENTS IS NOT THE WAY TO DO IT. NIETHER IS TRYING TO BRING IT TO OUR(AMERICAN) SHORES. IF IT IS ONE THING THE WORLD SHOULD HAVE LEARNED DATEING BACK TO THE PUNITIVE EXPIDITION BY "BLACKJACK PERSING" YOU DO NOT ATTACK US AT HOME. IT PISSES US OFF.
KILLING, INJURING INNOCENT AMERICANS JUST DOES NOTHING TO KOWTOW AMERICA. THREATENING OUR LEADER AND ATTEMPTING TO TAKE HIS LIFE UPSETS US. BLOWING UP BUILDINGS ON FORIEGN SHORES ... WELL THIS IS DISTASTEFUL TO US BUT WE ACCEPT OCCASIONAL ATTACKS. COMING TO OUR HOMES AND THREATENING US AND ATTACKING .... WELL THIS WILL OPEN A WHOLE BIG CAN OF WHUPASS.
THERE IS A POINT/LINE AMERICA AS A NATION WILL STAND TO, CROSS THIS LINE AND IT IS COMING. WE WILL TAKE THE GLOVES OFF. EVEN THE POLITICIANS IN WASHINGTON WILL CALL FOR IT. PEACENIKS WILL SILENCE THEMSELVES ONCE THEY BECOME TARGETS. ARE THESE ISLAMONUTS ABSOLUTELY SURE THEY WANT TO CROSS THIS LINE.
THE ACLY WILL NOT BE ABLE TO PROTECT THEM IF THEY DO CROSS THIS LINE. I ACTUALLY FEAR FOR THEM IF THEY DO. VIGILLANTISM IN MY OPINION WILL BECOME A NIGHTLY FEATURE ON THE NEWS AS AMERICANS GO AFTER THOSE WHO DARE TO COME TO OUR HOMES.