In an article, “Ban Ki-moon condemns UN Palestinian human rights official for backing 9/11 slurs,” Natasha Mozgovaya and Shlomo Shamir state “In a rare condemnation by the UN of an official within the organization, Ban said Falk's remarks were "an affront to the memory of the more than 3,000 people who died in the attack."
Falk who had already revealed his thoughts in the preface to one of David Ray Griffin’s books, in his blog posting used the assassination of a Swedish leader and the shootings in Arizona to persist in his conspiracy theories. He writes”
What fuels suspicions of conspiracy is the reluctance to address the sort of awkward gaps and contradictions in the official explanations that David Ray Griffin(and other devoted scholars of high integrity) have been documenting in book after book ever since his authoritative The New Pearl Harbor in 2004 (updated in 2008). What may be more distressing than the apparent cover up is the eerie silence of the mainstream media, unwilling to acknowledge the well-evidenced doubts about the official version of the events: an al Qaeda operation with no foreknowledge by government officials.Several persons, including the United States Ambassador to the UN, Susan Rice, have asked Ban to remove Falk from his position. But the answer seems to be that he was appointed by the “the Geneva-based Human Rights Council, a 47-nation body created by the UN General Assembly in 2006,” and therefore cannot be removed by the General Secretary.
Here is an interesting explanation by UN Watch Director Hillel Neuer about the problems with the UN's Human Rights Council.