A Tuen Mun school has confirmed that one of its teachers distributed marked copies of an A-level exam paper to his pupils, but said it had taken no action over the incident. Shum On-bong, vice-principal of YPI & CA Lee Lim Ming College, said he believed the teacher was just trying to let his pupils learn from past exam papers. But he stressed that the school had not agreed to the action and said it was still looking into the case. 'We are still following up on the case and all teachers are going to work as usual,' he said. 'At the moment, we have not reached any conclusions.' A spokeswoman for the Education Bureau (EDB) said it attached great importance to professional conduct. 'The EDB will follow up teachers' offences ... in a lawful, reasonable and just manner, taking into consideration the investigation findings, the nature and gravity of the cases,' she said. The Hong Kong Examinations and Assessment Authority said on Wednesday that the teacher had distributed 30 original marked copies of the paper among his pupils in breach of confidentiality requirements. The exams authority, which described the case as the first of its kind, said the teacher had admitted to the action.