A stone-laden vessel capsized at the outer anchorage of Chattogram port yesterday morning.
All five crew members were rescued, said Lt Abdur Rouf, media officer of Bangladesh Coast Guard East Zone.
The vessel named "MV Pinky" left for Noakhali around 3:30am after loading stone in the Karnaphuli Bridge Ghat area of the port city, the official said.
As the engine of the vessel went out of order around 6:30am, it collided with a merchant ship and started sinking, said Lt Abdur Rouf.
One of five crewmen jumped into the sea, and he was rescued by the crew of a nearby lighter vessel "MV Nafija Jahan".
The crew members of the lighter vessel informed about the accident to the Ctg Port Radio Control, which accordingly informed the coastguards.
The coastguards then sent a team to the spot, and they managed to rescue rest of the four crew members from the sinking vessel around 7:30am.