Bangladeshis attend a protest against Nusrat Jahan Rafi's murder by being set on fire after she had reported a sexual assault. File / Munir Uz Zaman / AFP
Bangladesh police were set to file charges on Wednesday against 16 people, including the headmaster of an Islamic seminary, over the shocking murder of a 19-year-old girl burned to death.
The killing of Nusrat Jahan Rafi last month sparked protests across the South Asian nation, with the prime minister promising to prosecute all those involved.
Rafi was lured to the rooftop of the Islamic seminary she attended where her attackers asked her to withdraw a sexual harassment complaint filed with police against the head teacher.
When she refused, she was doused in kerosene and set on fire. She died five days later, triggering outrage. Her death highlighted alarming rise in sexual harassment cases in the country.
Bangladesh's Police Bureau of Investigation said they would file the chargesheet in a court in the country's south later on Wednesday against the 16 people who include two girls who were classmates of Rafi.
"They are charged under the women and children repression law and we'll recommend death penalty for all 16 accused," PBI lead investigator Mohammad Iqbal told reporters.
Iqbal said the Principal of the Sonagazi Islamia Senior Fazil Madrasa Siraj Ud Doula where Rafi was a student ordered the murder from jail.
Rafi had gone to police in late March to report the alleged sexual harassment against the teacher, and a leaked video shows the local police station chief registering her complaint but dismissing it as "not a big deal."
Iqbal said at least five people including three of Rafi's classmates, had tied her up with a scarf before setting her on fire. The plan was to pass the incident off as a case of suicide.
Rafi suffered burns to 80 per cent of her body and died in hospital on April 10. But she recorded a video before her death, repeating her allegations against the principal.
Rafi's brother Mahmudul Hasan Noman said they want a fast-track trial. "We want all the culprits to be hanged to death," he told AFP.
The head of Mahila Parishad, a women's rights group, gave a "guarded welcome" at the quick investigation of the case but said more needed to be done to end a "culture of impunity" over sexual harassment and rape cases.
"Very few rape cases end in convictions," she said.
According to the group, about 950 women were raped in Bangladesh last year.
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A spokesman for the Australian flag carrier said Qantas "completely" rejected the suggestion that race was a factor in the incident.
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No casualties were reported and firefighters were able to bring the fire under control.