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A launch carrying around 50 passengers sank in the Shitalakkhya River in Narayanganj on Sunday.
Narayanaganj Superintendent of Police (SP) Jayedul Alam said an oil-laden tanker hit Munshiganj-bound launch ML Rabit Al Hasan around 6pm.
The launch capsized soon after the collision. Around 20 passengers managed to swim ashore while the rest are still unaccounted for, he said.
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Police said the oil tanker could not be seized as it did not stop after hitting the launch.
A salvage team was trying to spot the sunken vessel but the nor’wester delayed the process, the SP said.
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Members of Fire Service and Civil Defence and Naval Police are jointly operating the rescue drive, he added.