A front-page article on Thursday described a report by a committee at Columbia University formed to investigate complaints that pro-Israel Jewish students were harassed by pro-Palestinian professors. The report found "no evidence of any statements made by the faculty that could reasonably be construed as anti-Semitic," but it did say that one professor "exceeded commonly accepted bounds" of behavior when he became angry at a student who he believed was defending Israel's conduct toward Palestinians.

The article did not disclose The Times's source for the document, but Columbia officials have since confirmed publicly that they provided it, a day before its formal release, on the condition that the writer not seek reaction from other interested parties.

Under The Times's policy on unidentified sources, writers are not permitted to forgo follow-up reporting in exchange for information. In this case, editors and the writer did not recall the policy and agreed to delay additional reporting until the document had become public. The Times insisted, however, on getting a response from the professor accused of unacceptable behavior, and Columbia agreed.

Last Wednesday night, after the article had been published on The Times's Web site, the reporter exchanged messages with one of the students who had lodged the original complaints. The student was expecting to read the report shortly. But because of the lateness of the hour, and concern about not having response from other interested parties, the reporter did not wait for a comment for later versions, including the printed one, after the student had read the report.

Without a response from the complainants, the article was incomplete; it should not have appeared in that form. The response was included in an article on Friday.