Harvard secretly searched the e-mail accounts of several of its staff members last fall, looking for the source of news media leaks about its recent cheating scandal, but did not tell them about the searches for several months, people briefed on the matter said on Saturday.

The searches, first reported by The Boston Globe, involved the e-mail accounts of 16 resident deans, but most of them were not told of the searches until the last few days, after The Globe inquired about them. Resident deans straddle the roles of administrators and faculty members, teaching classes as lecturers while living in Harvard’s undergraduate residential houses as student advocates and advisers.

In August, an administration memo to the resident deans, on how to advise students being brought up on cheating charges before the Administrative Board, a committee of faculty members responsible for enforcing regulations, made its way to news organizations. The e-mail searches were intended to find the source of leak, but no one was disciplined in the matter.

Last August, Harvard publicly revealed that “nearly half” the students in a large class were suspected of having cheated on a take-home final exam in the spring of 2012 — either working together in violation of instructions, or outright plagiarizing material. Students identified the class as a government course with 279 people enrolled.