Three people including a woman and her son died allegedly after inhaling toxic gas inside a septic tank at Dhap Udoypur village in Mithapukur upazila of Rangpur on Thursday.
The deceased are Delwara Begum, 55, Ida Mia, 35, son of Delwara, and Iblul Mia, 35, son of Tobarak Hossain, of Dhap Udoypur village of Shalti Gopalpur union.
Harun-or-Rashid, chairman of Shalti Gopalpur union, said that a septic tank was being extended near the house of Delwara Begum in the morning.
At one stage, she fell inside it while trying to pick up a bottle gourd through a ladder.
Later, Ida Mia also got into the septic tank to save her mother and died.
To save both, Iblul also climbed down the septic tank and died there.
Later, a firefighting unit rushed to the spot and recovered the three bodies, said Mashiur Rahman, warehouse inspector of Mithapukur Fire Service.
