A 25-year-old man allegedly stabbed to death his father, mother, sister and grandmother following a quarrel in southwest Delhi's Palam area, police said on Wednesday.
The accused, identified as Keshav, has been arrested, they said.
On Tuesday at around 10:30 pm, police received information about a quarrel on the upper floor of a house, a senior police officer said.
After reaching the spot, police found four members of a family dead in their house, Deputy Commissioner of Police (southwest) Manoj C said.
The caller and his relatives caught hold of the accused and handed him over to the police, he said.
The primary investigation revealed that Keshav did not have a stable job. He used to work in a company in Gurgaon and left the job a month ago, police said.
Prima facie it seems that the accused killed his family following an argument, they said.
A case under section 302 (murder) of the Indian Penal Code has been registered in Palam police station and further investigation is on, police said.
