A three-storey building, built after filling a pond at Charail Khelarmath in Keraniganj, collapsed on Friday morning.
The building came crashing down around 8:20 am trapping eight people inside, said Faruk Ahmed, in-charge of the Fire Service Office.
Later, Fire Service and Civil Defence members rushed to the spot and rescued them around 9:30 am, he said.
“Taking risks, six families had been living in the building constructed without proper piling work,” said Faruk.
Officer-in-Charge of Keraniganj Model Police Station Mainul Islam said residents from another five risky buildings adjacent to the collapsed one have been evacuated to avoid any risk.
Utility services, including gas and electricity, have been cut off from the buildings.
