A 30-year-old woman allegedly poisoned her daughter before ending her own life in Jashore's Sharsha upazila on Tuesday night.
The deceased were identified as Sumi Khatun, 30, daughter of Sirajul Islam, and her six-year-old daughter Akhi Moni.
According to local residents, Sumi had been living in her parents' house in Shurarghop village of Laxmanpur union in Sharsha upazila since her divorce three years ago.
On Tuesday night, Sumi took the extreme step following an altercation with her mother in the evening. She first poisoned her daughter and then poisoned herself.
Sumi's family rushed the mother-daughter duo to Sharsha Upazila Health Complex and subsequently to Jashore General Hospital for better treatment. But Akhi was declared dead on arrival at the Jashore hospital, while Sumi died during treatment at 10 pm.
Badrul Alam Khan, officer-in-charge of the Sharsha police station, said the bodies were kept in the hospital morgue for autopsies.