The death toll in the explosion in Narayanganj’s Sharmin re-rolling mill rose to four.
Another person Zakaria, 20, son of Abdul Hye, of Nalitabari upazila in Sherpur, died while undergoing treatment around 11:45pm on Tuesday.
The body has been kept in the morgue.
Earlier, Mozammel, 35, Md Shariful, 26, and Md Saiful, 30, died while undergoing treatment.
Around 35% of Zakaria's body was burnt, said Sheikh Hasina National Institute of Burn and Plastic Surgery Resident Doctor Tariqul Islam.
On October 14, five people were admitted to the hospital.
Currently, one person named Iqbal, 25, is under treatment in critical condition. He has 25% burns on his body.
