CAMBRIDGE, Mass. (AP) — Harvard University is investigating whether dozens of undergraduate students cheated on a take-home exam last spring.

School officials said they discovered students may have shared answers or plagiarized on a final exam. They declined to release the name of the class, the students' names or the exact number being investigated, citing privacy laws.

The undergraduate class had a minimum of 250 students and possible cheating was discovered in roughly half the take-home exams, university officials said Thursday.

"These allegations, if proven, represent totally unacceptable behavior that betrays the trust upon which intellectual inquiry at Harvard depends," President Drew Faust said.

A Harvard spokesman said he knows of no incidents in recent memory of possible cheating at the university on this scale.

Each student whose work is in question has been called to appear before a subcommittee of the Harvard College Administrative Board, which reviews issues of academic integrity, said Jay M. Harris, dean of undergraduate education. He emphasized that none of the allegations has been proven and said there's no evidence of widespread cheating at Harvard.

"The facts that are before us are that we have a problem in this one course," Harris said. "I hope that doesn't sound overly naive, I don't want to be naive, but this is what we have. The rest would be speculation.

"Looking at the students we have and the work that they do, I would be loathe to say this is something that represents Harvard students generally."

The spring course included undergraduates at all class levels, Harris said. A teaching assistant noticed some possible problems on the tests, including evidence that students collaborated on answers or used the same long, identical strings of words. The exam had clear instructions that no collaboration was allowed, Harris said.

The assistant notified the professor, who referred the case in May to the administrative board. After interviewing some students, the board found what Harris characterized as "cause for concern."

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Depending on the offense, the punishments range from an admonition, a sort of warning for a first offense, to being forced to withdraw from Harvard for a year. It wasn't immediately clear what sanctions any student who has graduated may face.

There's no timeline for when the investigation will be finished, Harris said.

Michael Zimmet, a freshman from Aspen, Colo., said news of the investigation was surprising.

"You think of Harvard as somewhere where people are academically honest and interested in their course work," he said.

Tiffany Fonseca, a sophomore from Boston, said she didn't know the details of what happened, but that it was easy to see how students could talk to each other about a take-home test.

"I'm kind of shocked, but I'm not," she said.

In response to the allegations, a Harvard committee led by Harris will present recommendations on how to enforce faculty-wide expectations of academic honesty.

Teresa Fishman of the International Center for Academic Integrity at Clemson University said it is not surprising that Harvard isn't immune to possible cheating. She said 20 years of data shows that a quarter to a third of students across all levels of collegiate education admit cheating on tests.