Police have detained a madrasa teacher in Fatulla of Narayanganj city for allegedly trying to sexually assault a student, reports UNB.The detainee is Nizam Uddin, 25, a teacher of Ramarbagh Hafizia Madrasa.The victim’s mother said Nizam tried to commit sexual assault on the boy, 12, on Saturday and Sunday when he was asleep at night.He disclosed the matter to his mother when she went to visit him on Monday.Following a complaint, police detained the madrasa teacher around 10:00pm, said sub-inspector Fazlul Haque of Fatulla model police station.However, Nizam denied the allegation, saying the student fabricated the story as he asked him to study attentively.