Two construction workers died and another fell ill after inhaling toxic gas inside a septic tank in Lakshmipur's Raipur upazila on Sunday.
The accident took place in the afternoon in an under-construction building in front of Farukia Madrasa under Raipur municipality.
The deceased Kader, 21, son of Khorshed Alam, of Bayati house of Mirganj road, and Robin, 28, son of Zakir Hossain of the same house. Sick Shakib Hossain is also a resident of the same house. They were construction workers by profession.
According to fire service and locals, some bamboos fell into the septic tank while they were working. Robin and Kader went down to the tank to pick the bamboos. After a while, there was no response from them. Then Shakib went down to rescue them. Meanwhile, all three fell ill inside. At one stage, Shakib managed to come up but the other two could not.
Later, on information, members of the fire service rescued them and took to Raipur Upazila Health Complex where Robin and Kader were declared dead by the doctors.
Raipur Fire Service In-Charge Syed Ahmed confirmed it.