One of the students, who were injured in a blast at Tejturi Bazar in the capital, succumbed to his injuries at Sheikh Hasina National Institute of Burn and Plastic Surgery on Saturday.
The deceased was identified as Zitu Hasan, 28, a student of EMBA at Dhaka University and an inhabitant of Gangarampur in Pabna.
The explosion occurred at a house at East Tejturi Bazara, a neighbourhood of Tejgaon in the capital, around 9:30pm on Friday, leaving the duo wounded.
Though members of law enforcing agencies immediately visited the spot and collected different evidences to know about the reason of the blast, they have yet to come up with a conclusion that if it was an accident or act of sabotage.
Seeking anonymity, an official at Bomb Disposal unit under Counter Terrorism and Transnational Crime (CTTC), a specialised unit of Dhaka Metropolitan Police (DMP) to combat militancy, said accumulated methane gas might have caused the explosion.
Jahangir Alam, owner of a sanitary shop on the ground floor of the house, said they (he and other people there) heard a loud sound coming from inside the house and in a while saw two youths coming out of the residence with fire on their bodies.
Some locals quickly arranged for water and poured on their bodies, and rushed them to the institute for treatment, he said.
They were conducting an investigation into incident to know whether it was merely an accident or there was anything else behind it.
Abdul Latif, owner of the house, said five bachelors lived in the flat on the second floor. Of them, three did jobs.