A woman and her two children were found in unconscious state at Devprayag bank of the Ganga river on Friday morning, the police said.
Passersby rushed them to a hospital where two of them were succumbed and the third one was sent to AIIMS, Rishikesh.
The deceased were identified as Pramila, 45, and Rubbi 24. While Jatin, 22, was critical in a critical situation, as per the doctors.
Police are now searching for Pramila's husband who identified as Rajesh Kumar Malhan, resident of Jhajhar Haryana who is on the run. SOG team has been sent to Haryana to arrest him. Meanwhile, on being informed, the family members of the deceased reached Rishikesh on Friday evening.
Pauri Senior Superintendent of Police (SSP) Jagat Ram Joshi said that Rajesh Kumar Malhan had come to Devprayag with his wife Pramila, daughter Rubi and son Jatin on October 17 and stayed in Badri-Kedar Dharmshala situated in Tehri district.
The family left the Dharmshala at 4 pm to perform some religious rituals. While Rajesh Kumar returned to the Dharmshala alone at around 9 pm his wife and two children were found unconscious beneath the Devprayag Bridge on Friday morning. Preliminary probe suggests that they were poisoned. Jatin is said to have told police that they had fallen unconscious after they drank water.
SSP Joshi said that, "Rajesh Kumar has been suspected to mixed poison in the water and given them to drink. The case has been registered by the family member of the victim, he added.