The gunmen killed Shahjahan near his house at Ghoraberia and his brother Sheikh Saleem at Mundeswari river ferry ghat almost at the same time yesterday.
Two persons including a woman were also injured when the assailants fired on Sheikh Saleem. They have been admitted to a hospital, police said.
Altogether 16 persons have been arrested in connection with the double murder since yesterday and arms and ammunition were seized from their possession.
Senior TMC leaders Firhad Hakim, Mukul Roy and Sultan Ahmed today visited the house the brothers.
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