Police recovered a body of an unidentified man, aged around 32, stuffed inside a sack, from the Buriganga River at Kamrangirchar in the capital on Tuesday.
Local people informed police after noticing a sack floating in the river around 11am, said officer-in-charge of Keraniganj Model Police Station Ferdous Hossain.
Later, police recovered the body, dressed in black pants and black T-shirt, and sent it to Sir Salimullah Medical College Hospital for an autopsy.
The deceased was a physically challenged person with a single arm.
Tied in the bag, the dead body might have been dropped into the river with an intention to disappear it after killing, the OC assumed primarily.