Police and Fire Service personnel recovered the bodies of a man and his seven-month-old twin daughters from his father-in-law's house in Banshkhali upazila of Chattogram on Friday afternoon.
The deceased were identified as Md. Zahed, 55, son of late Badiul Alam, a former acting chairman of Banshkhali Upazila Parishad, and his seven-month-old twin daughters, Jasia Jannat and Jarin Jannat.
Police said Zahed's body was found hanging from a concrete pillar, while the infants' bodies were recovered from a bed inside their locked home in Puichhari union.
The victim's wife, Afia Begum, said she left the babies home with Zahed around noon to attend a prayer at a local mosque.
Returning in the afternoon, the family found the doors locked, prompting neighbors to call emergency services. Fire Service personnel subsequently broke open the door.
Officer-in-Charge Md. Rabiul Haq of Banshkhali Police Station, said the bodies were sent to Chattogram Medical College Hospital (CMCH) morgue for autopsies.
Police suspect family dispute or mental depression behind the deaths and have taken Zahed's wife, mother-in-law, and sister-in-law into custody for questioning.