Two minor siblings allegedly drowned in a lake at Karbaripara in Alikadam upazila of Bandarban district early Saturday.
The deceased were identified as Marufa Jannat, 7, and Mahfuza Jannat, 40, both daughters of Mohammad Mahmudullah of the area.
The two siblings went missing on Friday afternoon after stepping out to fetch some water, said Abul Kalam, chairman of No 2 Choikhong union.
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Later their family members, along with local people, searched for them. Around 2am, they found the body of Marufa floating in the lake. Subsequently, Mahfuza's body was fished out of the lake.
Local people suspect that they might have met the watery grave while trying to pluck mangoes from a tree adjacent to the lake.