A Ro Ro ferry with 17 goods-laden trucks and several other light vehicles tilted and sank partialy at Ferry Ghat No. 5 of Paturia dock on Wednesday.
The accident occurred around 9:00 am when the vessel, Shah Amanat, was preparing to anchor at the dock.
Some of the people on the ferry managed to swim ashore when it sank, the sources said.
Upon receiving the news, the diving unit of the fire service was working on the spot, the soerces added.
Deputy general manager (DGM) of Bangladesh Inland Water Transport Corporation (BIWTC) at Paturia Ghat Zillur Rahman said the Shah Amanat ferry coming from Daulatdia Ghat loaded with vehicles and passengers tilted at the ghat no 5 while anchoring.
The ghat was blocked after the ferry tilted, he said, adding that the authority is trying to solve the problem.
The official said no casualty was reported so far.