Soon after the 9/11 attacks, anti-Semitic 9/11 conspiracy theories began appearing in the United States and abroad. In the Middle East, Al-Manar, a Lebanese TV station was one of the main sources for the theory that 4,000 Israelis had been told to stay home on the day of the terrorist attacks. Publications on the extreme right, particularly the American Free Press (AFP), an anti-Semitic conspiracy-oriented newspaper, played a big role in promoting a variety of anti-Semitic 9/11 conspiracy theories. Although the AFP is still a regular source of such propaganda, 9/11 anti-Semitic conspiracy theories are now more influentially being promoted by a group of anti-Israel conspiracy theorists who endorse and reinforce each other's work. They blame Israel for many nefarious deeds and false flag operations.

This group of anti-Israel conspiracy theorists includes Gordon Duff, who runs the anti-Semitic Web site Veterans Today; Alan Sabrosky, a former U.S. Army War College instructor who writes for Veterans Today; and Kevin Barrett, who runs the Truth Jihad Web site and Internet radio show.  They have become the most popular promoters of theories claiming that Israelis and Jewish members of the Bush administration carried out the 9/11 attacks as a false flag operation to provoke a war against Israel's enemies. Articles by Sabrosky and Duff promoting anti-Semitic conspiracy theories have been picked up in the extreme right press in the United States and elsewhere, as well as in Islamic media sources.  These theorists paint Israel or the "Israel lobby" as ruthless and willing to commit mass murder to further its goals of acquiring power and destroying enemies. They further connect Israel's alleged masterminding of 9/11 attacks with allegations regarding Israeli mistreatment of the Palestinians, thus making the 9/11 theories part and parcel of an overall anti-Israel agenda.

To support their anti-Semitic claims, conspiracy theorists have unleashed a flood of books, videos, DVDs and Web sites that proclaim that Jews and/or Israelis were behind the 9/11 attacks. Online video sites such as YouTube and Google Video have become particularly popular ways to find audiences for the conspiracies.  Two videos in particular, Missing Links: The Definitive Truth About 9/11, produced by anti-Semite Mike Delaney, and War by Deception, by conspiracy theorist Ryan Dawson, make virulently anti-Semitic claims about the 9/11 attacks. The two films, both more than two hours long, along with thousands of other videos on YouTube blaming Jews or Israel for 9/11, have been viewed by tens of thousands of people.

Social networking sites such as Facebook similarly play host to groups that claim that Jews and/or Israelis carried out the 9/11 attacks. In addition, numerous Web sites, including Veterans Today, Rediscover 911, and many others, promote anti-Semitic 9/11 conspiracy theories.