Shyamal Kanti Bhakta of Piyar Sattar Latif High School in Bandar Upazila was beaten up by local people after some unidentified persons using the megaphone of a mosque propagated that Bhakhta made offensive comments about Islam while he was punishing a Muslim student for not studying.
Bhakta was rescued by police after he was beaten up and made to do sit-ups holding ears in the presence of ruling Awami League lawmaker Selim Osman.
Bhakta has denied making any statement against Islam and claimed that some people in school management held grudges against him.
The traumatised teacher was then admitted at a local hospital under police protection.
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Education minister Nurul Islam Nahid termed the humiliation of the headmaster as "unacceptable and inhumane", and said that action would be taken after the three-member inquiry committee submitted its report.
Education official AKM Nurul Amin, who heads the three-member inquiry committee, said that during the initial investigations it was found that Bhakhta had beaten up a student, "but we also received information that the attack on him was part of a conspiracy".
The 10th grade student, who was slapped by the teacher, later told media that Bhakhta did not made any offensive comments about the religion. "I went to the managing committee to seek justice as he slapped me, but the sir (Bhakhta) did not make any remark about the religion," the student said.
Meanwhile, law minister Anisul Huq today said the government was determined to bring to justice perpetrators of public humiliation of the headmaster.
Last month, two Hindu teachers were jailed for six months for making blasphemous comments about Islam under a colonial-era law that makes insulting any religion a crime in the Muslim-majority country.