Two siblings drowned in Netai River in Dhubaura upazila yesterday afternoon. The victims are Shariful Haque, 6 and Ariful Haque, 8, sons of Azizul Haque, a day labourer of frontier village Kalsindur. Mir Alimuzzaman, officer in-charge of Dhubaura police station, said Shariful accidentally fell into the river while he was playing on a boat at around 3.30 pm. In the mean time, Ariful, who was on the bank of the river, jumped into the river to save his brother. Both of them did not know how to swim.