The schools inspectorate says it is still too early to decide what should be done about the Ibn Ghaldoun school in Rotterdam which is at the centre of an exam scandal.
Three pupils are in custody in connection with the theft of 24 final exam papers and there have been calls for the school to be closed down.
Chief inspector Rick Steur told Radio 1 news a decision will be taken once the public prosecution department has completed its investigation. However, it is clear the leaked papers have been spread beyond Rotterdam, he said.
Schools have been asked to report any unexpectedly good results or other unusual patterns and a hotline has been set up for pupils to report any wrongdoing. That information will be passed on to police, Steur said.
On Wednesday, the education ministry decided that no-one outside the Rotterdam school will have to retake any exams. All pupils at the Ibn Ghaldoun will have to retake exam papers which were stolen.
School leavers all over the country will find out on Thursday if they have passed their exams or not.
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