Three children of the same family drowned in a pond in Patuakhali's Kalapara upazila on Friday.
The incident took place in Zia Colony area at around 12 pm.
The deceased were Sharmin, 6, Ruman, 8 and Maryam, 8. Sharmin and Ruman were siblings, children of Sohel Fakir of that area. Maryam was daughter of Sohel's younger brother Rubel.
According to police and locals, the trio slipped into a pond next to their house while they were playing near its bank.
Later, they were rescued and taken to Kalapara Upazila Health Complex where the on-duty doctor declared them dead.
Kalapara Police Station officer-in-charge Md Jasim confirmed the matter.