Witnesses said a fire extinguisher cylinder exploded with a huge bang at around 2:00pm, killing Mukul Sarkar alias Nitai, owner of the workshop, Nitu Enterprise. The explosion took place when he was testing the pressure of the cylinder at around 2:00pm with the shutter of the workshop half open. He was alone at the workshop at that time.

The force of the explosion was so intense that parts of the cylinder blew away the shutter before smashing a wall of a room of a tin-roofed building located opposite the workshop, some 10 feet away.

Six people lived in the room but all of them were out for lunch during the incident.

"I heard a huge bang and then I saw the wall of my room collapse as something hit it," Shaheen Sheikh, a welding mechanic, told The Daily Star.

He also said that when he looked at the workshop, he saw the beheaded body of Nitai.

Police recovered the body and sent it to Dhaka Medical College morgue for autopsy.

Nitai was a resident of Bashabo area in the city.