A sand-laden bulkhead sank in the outer anchorage of the Chittagong Port during a storm on Wednesday morning.
Coast Guard members rescued five crew of the vessel after the accident.
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The bulkhead with five crew on board sank at Charlie anchorage of the port during a nor'wester in the area around 10:30am, said Md Omar Faruq, secretary of the Chittagong Port Authority.
However, vessel movement remained undisrupted, he added.