The main gas supply line to Narsingdi was damaged during construction work on a drain, according to Titas Gas authorities
The incident took place at Dholpur near the RAB-10 camp around 8:30am on Friday, said Kazi Wazed Ali, chief of Jatrabari Police Station.
The victim has been identified as seven-year-old Tahsin.
The injured were identified as Sumon, 40, his wife Sajuli, 35, their son Nishan, 14, and Sumon’s aunt Ator Begum, 70, and their neighbours Alamgir, 30, and his wife Kazli, 24.
Four firefighter units were dispatched to the scene and took injured to the Dhaka Medical College Hospital, said firefighter Rashed Sikder.