Two children drowned in a river in Kohorpara village of the district's Sadar upazila on Tuesday, police said on Wednesday.
The deceased were identified as Siam (9), son of Yunus Ali, and Masum Billah (11), son of Monsur Ali of the village.
Tanvirul Islam, officer-in-charge of Sadar police station, said four children, including Siam and Masum, went to the river for taking a bath in the afternoon.
"At one stage, they went missing. On information, divers rushed to the spot and rescued them," the OC added.
Later, Siam and Masum were taken to Thakurgaon General Hospital, where doctors declared them dead on arrival.
Abu Taher Muhammad Samsuzzaman, upazila nirbahi officer, met the deceased's families and provided them with financial assistance.
