A minor couple in Thakurgaon's Khalipur village allegedly ended their lives by consuming poison after their families rejected their marriage proposal.
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The deceased were identified as Jatan Chandra Singha, 18, son of Debendra Chandra Sing, and Sumi Bala, the 14-year-old daughter of Jatin Chandra of Baliadangi upazila.
According to the relatives of the deceased, Shumi and Jatan had an affair but their families were opposed to the relationship as both of them were distant cousins and minors.
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On Tuesday, the two took the extreme step after their families again disapproved of their relationship, police said. They were taken to a local hospital, where doctors declared them dead on arrival.
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A case of unnatural death has been filed in connection with the suicides at the local police station, an official said.