BYU will conduct an official review of Jones' actions before determining a course of action, university spokeswoman Carri Jenkins said. Such a review is rare for a professor with "continuing status" at BYU, where Jones has taught since 1985.
Jones was teaching two classes this semester, which began Tuesday. Other professors will cover those classes, and Jones will be allowed to continue to do research in his area of academic study, Jenkins said.
Jones became a celebrity among 9/11 conspiracy-theory groups after he wrote a paper titled "Why Indeed Did the World Trade Center Buildings Collapse?" The paper was published two weeks ago in the book "9/11 and American Empire: Intellectuals Speak Out" and lays out Jones' hypothesis that the three towers fell because of pre-positioned demolition charges not because of the planes that hit two of the towers.
When Jones began to share his demolition theory publicly last fall, he politely declined to speculate about who set the charges other than to say terrorist groups couldn't have been the source.
Then, later, he started to speak publicly about research conducted at BYU on materials from ground zero. He said he found evidence of thermite a compound used in military detonations in the materials.
In recent weeks, after becoming the co-chairman of the group Scholars for 9/11 Truth, Jones seemed willing to go further, implicating unnamed government groups but not President Bush.
The Deseret Morning News requested a statement from the university Wednesday afternoon for a story it was preparing on Jones and his high-profile role in the 9/11 truth movement. University officials informed Jones of the decision to place him on leave Thursday afternoon and released a statement to the newspaper Thursday night.
"BYU has repeatedly said that it does not endorse assertions made by individual faculty," the statement said. "We are, however, concerned about the increasingly speculative and accusatory nature of these statements by Dr. Jones."
Last fall, BYU faculty posted statements on the university Web site that questioned whether Jones subjected the paper to rigorous academic peer review before he posted it at physics.byu.edu. Jones removed the paper from BYU's Web site Thursday at the university's request.
Efforts to reach Jones prior to press time Thursday night were not successful. He later declined comment. Jones told the Deseret Morning News on Wednesday that his paper had gone through an unusual third round of peer review in what is now an apparently unsuccessful effort to quell concerns on campus.
"BYU remains concerned that Dr. Jones' work on this topic has not been published in appropriate scientific venues," the university statement said.
Jenkins said BYU's reputation was a consideration, too.
"It is a concern when faculty bring the university name into their own personal matters of concern," she said.
Jones, also known for his cold fusion research, provided academic clout to the 9/11 truth movement. C-SPAN repeatedly broadcast a conference that featured Jones this summer. Recent articles about Sept. 11 conspiracy theories that focused at least in part on Jones have appeared in the New York Times, the Washington Post, the Guardian in London and other publications.
Recent rebuttals to the demolition theory have been released by the State Department and the National Institute of Standards and Technology, which published a 10,000-page report on the towers' collapse.
A modified version of Jones' paper was scheduled to be published this week in the online Journal of 9/11 Studies. Jones is a co-editor of the journal.
BYU does not grant tenure, generally regarded as a permanent position, to professors. However, it does give continuing status to professors found worthy after six years on campus.
"Continuing status," Jenkins said, "grants the expectation that faculty members will have continuing employment at the university, although it is not a guarantee. They still need to meet satisfactory performance levels for scholarship, citizenship and teaching."
The review will be conducted at three levels by the administration, the College of Physical and Mathematical Sciences and the Physics Department.
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