Three workers have died after inhaling toxic gas during cleaning chest house of a Paper Mill at Jogarapara in Kahalu upazila on Monday morning.
The deceased are mill operator Hira, 25, son of Majed Ali, from Jhinai village, Ador Ali, 22, son of Abdul Karim, from Jogarapara village in the upazila, and the rest is Shahadat, 19, son of Ejaruddin, from Kurahar village in Shibganj upazila.
Police recovered the bodies and sent those to the morgue of Shaheed Ziaur Rahman Medical College Hospital for autopsy.
Witnesses and workers said Azad Pulp and Paper Mill reopened after the eid vacation on Monday and its three aforesaid workers fell unconscious around 11am during a move to enter chest house of the factory by a ladder.
The trio were whisked off to the hospital where physicians declared them dead.
On the way to hospital, another worker also got injured when the truck carrying the workers head-on collided with a microbus at Godarpara.
When contacted, Bogra Senior Assistant Superintendent of Police (media) Gaziur Rahman Sagar blamed the negligence of the mill authorities for the accident.
The factory remained closed for seven days and they should have examined the tank by experts whether any toxic gas stored inside it, Gaziur Rahman Sagar continued.
Bogra Superintendent of Police Asaduzzaman visited the spot.