She is suspected of having poured kerosene on Nusrat's body
The female suspect, Kamrun Nahar Moni, who allegedly poured kerosene on Nusrat's body, has been placed on five-day remand.
Feni Senior Judicial Magistrate Sharif Uddin Ahmed passed the order around 1pm on Wednesday.
Confirming the matter to Dhaka Tribune, Police Bureau of Investigation (PBI) Additional Superintendent of Police (ASP) Moniruzzaman said: "One of the prime accused of the case, Shahadat Hossain Shamim, in his confessional statement to court, said Kamrun Nahar Moni poured kerosene on Nusrat's body before she was set on fire.
"Shamim also said Moni is the one who supplied them with the three burqas and gloves."
"The confessional statement matches Nusrat's description of the incident — that she provided while undergoing treatment at the hospital."
The suspect, Kamrun Nahar Moni, Nusrat's classmate, was detained from in front of the Sonagazi Islamia Fazil (Degree) Madrasa on Tuesday at noon.
Nusrat, who was an Alim examinee, suffered 80% burns when she was set on fire — by four burqa-clad unknown assailants, who were allegedly followers of now suspended madrasa Principal Sirajuddaula — on the roof of the institution at Sonagazi on April 6.
She was attacked for refusing to withdraw a case her family had filed, last month, against Sirajuddaula for sexually harassing and assaulting her.
After she was set on fire, her family filed another case against eight people, including Sirajuddaula, on April 8.
The 18-year-old girl died at Dhaka Medical College Hospital on April 10 after five days of treatment.