Sheikh Hasina made the remark when Nusrat's family members met her at her official residence Ganobhaban, said PM's Press Secretary Ihsanul Karim.
Nusrat's parents -- AKM Musa and Shirin Akhter -- as well as her two brothers went to the Prime Minister’s Office in the morning.
The Prime Minister consoled the family members and expressed her deep sympathy for them.
“No culprit will be spared from legal action,” said Sheikh Hasina, assuring the family members of extending all sorts of support to them.
Chairman of NRB Global Bank Nizam Chowdhury was present.
Nusrat, a student of Sonagazi Islamia Senior Fazil Madrasa in Sonagazi upazila of Feni, was set afire on April 6 allegedly for refusing to withdraw a case filed against principal Siraj Ud Doula of the madrasa for sexually harassing her last month.
After fighting for life for five days, the madrasa girl died at Dhaka Medical College Hospital on April 10.