The gas leak of Diammonium phosphate occurred around 10:50pm at one of the gas tanks at DAP Fertiliser Company Ltd's Factory 1 in Rangadiya, on the south shore of Karnaphuli River near the Chittagong Urea Fertiliser Limited (CUFL).
The factory's Managing Director Amal Barua confirmed the news to the Dhak
Many of those who had fallen ill from the effects of theleaked gas were rushed to the Chittagong Medical College Hospital.
Those admitted at the hospital were suffering from respiratory complications brought on by ammonia inhalation, said Sub-Inspector Jahirul Islam of CMC police outpost told the Dhaka Tribune.
Several of those admitted at the CMCH were in critical condition, he said.
Exposure to high concentrations of ammonia in air causes immediate burning of the nose, throat and respiratory tract. This can cause different complications and may even result in respiratory distress or failure.
Fire Service's Agrabad Headquarters Deputy Assistant Director Jasim Uddin told the Dhaka Tribune that a major gas leak had taken place one of gas reservoirs at the factory in Rangadiya.
Eight to ten fire fighting units were working to contain the leak as of filing this report at 1am.
CMP Deputy Commissioner Harun-ur-Rashid said police were trying to evacuate people from the immediate proximity of the factory.