KATHMANDU: Frequent incidents of question paper leakage prior to examination have raised questions on the credibility of the Higher Secondary Education Board (HSEB). Narayan Koirala, spokesperson for the HSEB, said the HSEB had formed a seven-member probe committee headed by its vice chairman Dr Upendra Koirala including representatives from the Ministry of Home Affairs and Police Headquarters to investigate into the leaking of question papers. However, the Guardians' Association Nepal has accused the HSEB of carelessness. "The probe committee is incomplete and should also include representatives of the Ministry of Education," said Suprabhat Bhandary, president of the GAN. Koirala, however, said the committee would probe into the case. "We will soon publicise the findings of the investigation and bring the culprits to book," he added. The examinations for accounts and mathematics will be held on May 26 and 27 respectively. "The date for re-examination of other cancelled papers will be fixed later," said Koirala.