A dozen students in France are being questioned by judicial authorities for leaking maths questions for the country’s rigorous baccalaureate exam for school students.
The prosecutor’s office said the students suspected of leaking questions via social media were being held after being detained on Tuesday and Wednesday.
Seven others have been freed.
Fraud suspicions emerged in the midst of the six-day exams which ended on June 24, and education minister Jean-Michel Blanquer filed a complaint.
Fraud for exams carries the risk of prison and steep fines.
The exams are also being dogged by the refusal of a minority of teachers to mark the tests needed to enter university because of their concerns over government reforms.
Mr Blanquer on Wednesday denounced “sabotage” by angry examiners, warning they risked having two weeks’ salary withheld.