11 attacks in 2001 at a BYU seminar attended by around 60 people. Jones claimed that a variety of evidence defies the mainstream collapse theory and favors controlled demolition, using thermite. The evidence Jones cited included the speed and symmetry of the collapses, and characteristics of dust jets. Later, Jones said he had identified grey/red flakes found in the dust as nanothermite traces and that the thermite reaction products (aluminium oxide and iron-rich microspheres) were also found in the dust. He called for further scientific investigation to test the controlled demolition theory and the release of all relevant data by the government. Shortly after the seminar, Jones placed a research paper entitled "Why Indeed Did the WTC Buildings Collapse?" on his page in the Physics department Web site, commenting that BYU had no responsibility for the paper. Jones subsequently presented the WTC research in lectures at Idaho State University, Utah Valley State College, University of Colorado at Boulder and University of Denver, the Utah Academy of Science, Sonoma State University, University of California at Berkeley and Davis, and the University of Texas at Austin. On September 7, 2006, Jones removed his paper from BYU's website at the request of administrators and was placed on paid leave. The university cited its concern about the "increasingly speculative and accusatory nature" of Jones' work and that perhaps Jones' research had "not been published in appropriate scientific venues" as reasons for putting him under review. The review was to have been conducted at three levels: BYU administration, the College of Physical and Mathematical Sciences, and the Physics Department. However, BYU discontinued the review. Some of Jones' colleagues also defended Jones' 9/11 work to varying degrees, and Project Censored lists his 9/11 research among the top mainstream media censored stories of 2007. Jones' placement on paid leave drew criticism from the American Association of University Professors and the Foundation for Individual Rights in Education. Both organizations have long been critics of BYU's record on academic freedom. Jones "welcomed the review" because he hoped it would "encourage people to read his paper for themselves," however the school abandoned the review and Jones elected to retire, effective January 1, 2007. Jones has been interviewed by mainstream news sources and has made a number of public appearances. Jones has urged caution in drawing conclusions. In one interview, Jones directly called into question the government's theory regarding the attacks