Four children, including two siblings, drowned while taking bath in the Kakon River at Barokanda village in Raipura upazila of Narsingdi on Thursday.
The deceased were identified as Jannat Islam, 9, and Asheya, 9, daughters of Rubel Mia, Tabia, 13, daughter of Shamim Mia, and Sumaiya, 10, daughter of Billal Mia, of the Barokanda village. They were students of a local madrasah.
Witnesses said 6-7 madrasah students went to the river at noon for a bath after classes.
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At one stage, a child went under water in the river. Other children then tried to rescue her but four of them drowned during rescue operation.
Later, locals rescued them and took them to Raipura Upazila Health Complex, where doctors declared them dead.
Two other children were rescued alive, said Officer-in-Charge of Raipura Police Station Md Mujibur Rahman.
Medical Officer Ashraful Rahman said the children were brought to the hospital dead.