Police found bodies of four members of a family at a house in Masterpara area of Madhupur upazila in Tangail on Friday morning.
The bodies bore injury marks, said the police.
The deceased are Osman Gani, 52, his wife Tazreen, 37, their son Tariqul Islam Tazel, 20, and daughter Sadia, 7.
According to locals, Osman Gani started living in Masterpara a year ago. One of their relatives came to visit him in the morning.
He informed neighbours as he smelled stench. They then informed the police.
Police recovered four decomposed bodies from the spot.
Madhupur police station officer-in-charge Tarique Kamal confirmed this to Prothom Alo.
The police official said they suspect four family members were murdered a couple of days ago.
Assistant police commissioner of Madhupur circle Kamran Hossain said two teams of Police Bureau of Investigation (PBI) and CID would visit the crime scene soon.
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