At least five people sustained severe burns in a fire triggered by a gas leakage at Niki Dyeing Factory in Kanchpur-Noyabari area of Sonargaon.
The victims are security guards Heaven Chakma, 22, and Najir Uddin, 25; and workers Alam, 25, Mehedi Hasan, 24 and Bashir Ahmed, 25.
They are being treated at Sheikh Hasina National Institute of Burn and Plastic Surgery.
Dr Partha Shankar Pal said Mehedi suffered 60% burns, Bashir 48%, Najir 22%, Alam 17%, and Heaven 15%.
Factory Manager Mahbubur Rahman said gas leakage in the RMS room sparked the fire in the early morning.
Deputy Director of Narayanganj Fire Service Md Tanharul Islam said the workers got injured while dousing the blaze.
Assistant Manager of Sonargaon Titas Gas Company said the dyeing factory authorities did not inform them about the leakage but they are looking into the matter.