Fire fighting units have started their rescue operation for the third day this morning at the building in Dhaka's Gulistan area, where at least 20 people lost their lives in a deadly explosion Tuesday.

The rescue work started around 8:45am, Anwarul Haque, vice principal of the Fire Service Training Complex, told The Daily Star.

"We started working at 8:00am. As there was a lot of water under the building at that time, the water was irrigated and the rescue work started around 8:45am," he added.