A conflict over a love marriage at Bolorampur village in sadar upazila ended up in the killing of the new bride and her mother early yesterday.
The victims were identified as bride Muki Rabeda, 18, and her mother Sufia Khatun, 40.
Police said Muki Rabeda secretly married his cousin Rajib, son of Abdul Khaleq of Rajapur village, 25 days ago after a long affair. But Rajib's family did not accept the marriage.
On the fateful night, some assailants slaughtered Sufia and strangled Muki to death. Sufia's one-year-old son Abir was also injured in their attack.
Police said Sufia and her daughter were killed following the dispute over the marriage.
Meanwhile, police arrested three people, including Rajib, in this connection.