The incident took place in the Dankaur area yesterday.
Three brothers, Bunty (8), Vinit (5) and Nakul (18 months), residents of Talda village were poisoned by an unknown person, Station House Officer (SHO) at Dankaur police station Farmud Ali said.
The children were rushed to Sharda Hospital in Greater Noida, where Nakul was declared brought dead while Vinit and Bunty were critical, the official said.
Officials said that investigations are being conducted in the matter.
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