A lighterage vessel carrying iron scraps sank in the Karnaphuli River near the Chattogram port on Wednesday.
No casualty was reported as all the 14 crew managed to swim ashore.
Omar Faruk, secretary of the Chattogram Port, said the vessel - Barnia Prince-2 - was carrying 2,246 tonnes of iron scraps for AKS steel mill from a mother vessel.
When the accident took place in the morning, the vessel was anchored at the outer anchorage of the port amid severe current in the river. At one stage, it hit a buoy after its anchor got severed.
Later, it sank there as a crack developed at its bottom.