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CAMBRIDGE, Mass. -- Dozens of Harvard University students are being investigated for cheating after school officials discovered they may have shared answers or plagiarized on a final exam.

Harvard officials aren't releasing the class subject, the students' names or the exact number being investigated.

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

Harvard President Drew Faust said the allegations, if true, betray "the trust upon which intellectual inquiry at Harvard depends."

Each student whose work is in question has been called to appear before a review board.

Jay M. Harris, the dean of undergraduate education, said there's no evidence of widespread cheating. But he said it's clear Harvard needs to better emphasize academic integrity.

JAY LINDSAY, Associated Press