The answers to the math test for the ninth grade appeared on a social networking site on June 6, about 30 minutes after the envelope with the tests was opened, IPN reports.

In a press release, the Education Ministry expresses its regret at the leaking of information. It says that this case reveals the weak vigilance of the school examination commission.

“We are confident that the methodology was observed in most of the locations and, in this case, the participants in the exams acted correctly, while the students didn’t have access to social networking sites,” it is said in the press release. The Ministry asked the competent authorities to determine the source of these answers.