A couple allegedly killed their two children and then committed suicide on Tuesday by jumping off the eighth floor of an apartment complex in Ghaziabad, Uttar Pradesh.
Police said the couple committed suicide because they were steeped in financial difficulties.
Another woman, believed to be the second wife of the man, also jumped off the building. She survived the fall, but is in a critical condition, police said.
The incident took place in the Krishna Sapphire Apartment in the posh Indirapuram area in Ghaziabad.
Senior Superintendent of Police (SSP) Sudhir Kumar Singh, who was present at the scene, said: "Early Tuesday, it was reported that three people had jumped from the eighth floor of Krishna Sapphire. The police reached the spot, found a man and a woman dead and another woman seriously injured, who was admitted to a hospital. In the deceased's flat, the bodies of an 11-year-old girl and a 13-year-old boy were found."
"Investigation so far revealed that the person had come to this house about one and a half month ago. It is learned that he committed suicide due to financial constraints, " police added.
Singh said a suicide note has been found on a wall of the flat, which is being investigated.
The security personnel and the neighbours told the police that the family had regular fights.