As many as 125 students at America's prestigious Harvard University are being investigated for allegedly cheating in their final exam, administrators have revealed.
The official university site reported that a large number of undergraduates "may have inappropriately collaborated on answers, or plagiarised classmates' responses, on the final exam for the course".
An initial investigation by the Harvard College Administration Board of more than 250 final exams resulted in cases of alleged cheating involving "nearly half the students for the course".
The Ivy League college has not identified the course, or the students allegedly involved in the scandal - one of the largest to affect Harvard.
But student newspaper, The Harvard Crimson, said it was Government 1310: "Introduction to Congress" course.
The allegations arose when a faculty member noticed "similarities between a number of exams".
Anyone found to have cheated could face punishments, including a one-year suspension from the college.
Michael Smith, dean of the Faculty of Arts and Sciences, said: "We take academic integrity very seriously because it goes to the heart of our educational mission.
"Academic dishonest cannot and will not be tolerated at Harvard.
"These allegations, if proven, represent totally unacceptable behaviour that betrays the trust upon which intellectual inquiry at Harvard depends."
Harvard, in Cambridge, Massachusetts, is one of the most exclusive universities in the world, with students paying around £40,000 a year to attend.