Four persons were killed due to suspected gas poisoning at a biogas plant in Haryana's Kurukshetra district on Wednesday, police said.
The victims included a man and his two sons, who were choked to death at Dera Rampur village.
The bodies were sent for post-mortem to the Civil Hospital in Kurukshetra, around 110 km from here.
Police said that the exact cause of death was being probed.
--IANS
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