The deceased have been identified as Urmila Jindal, her daughters Sangeeta Gupta (56), Nupur Jindal (48) and Anjali Jindal (38) and their security guard Rakesh (42), the police said.
The house is located in a compound where seven families comprising 40 members reside. One of the families comprised of Urmila and her three daughters. The other six families are from her husband's side.
Police officials suspect that someone known to the victims might have killed them, since, till now, there is no evidence of forced entry into the house.
Nupur Prasad, Deputy Commissioner of Police (Shahdara), said that Urmila was planning to sell off some of her properties.
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The officer said that so far, they haven't found any evidence of a property dispute among the family members.
The Jindals have been living in the area since 1931 and are a business family.
A man, who comes to deliver flowers at the residence daily, arrived as usual but the security guard did not come to collect the flowers at around 6.30 am today.
He informed Urmila's nephew Rakesh Jindal, who was going for his morning walk. The guard's throat was slit, he said, adding that the police were informed.
The security guard was employed with the family for the last eight-nine years
After the police team arrived, the family's driver was sent upstairs to Urmila's house to get the keys of the car, so that it could be removed from near the guard's body, said a family member.
The body of Sangeeta Gupta was found lying on the bed while the bodies of her mother and sister were found lying on the floor with almirahs strewn open, the police said.
Police, however, suspect that the house had been ransacked to pass it off as a robbery.
"The jewellery on the bodies of the women was untouched. An expensive cell phone was found lying next to the bodies," said an official privy to the probe.
Police suspect that the killings were carried out by at least five persons after midnight.
The victims' necks had been slit. It is suspected that a butcher's knife was used to carry out the killings, said the official.
Urmila's husband Ram Kishan Jindal had died around seven-eight years back. She lived with her three daughters.
Sangeeta Gupta was a widow and had been staying at her mother's place for the last 20 years. The other two daughters were unmarried. Her daughter Abha lives with her husband and two children in Sarvodaya Enclave.
Urmila's husband was the youngest among five brothers. One of her husband's brothers, Amar Nath, is alive while the rest have passed away.
There were some people who hinted that the killings could be a fallout of a property dispute between the families. However, Rakesh Jindal denied the reports.
"There was whitewash work going on in the house for the last fortnight. Yesterday, the workers were scolded for negligence.
"They had not covered the car properly while they were painting the ceiling beneath which the car was parked," he claimed. He raised suspicion over the involvement of those workers in the killings.
"They have been living in this area since 1931. They look like a happy family," said a family friend.
Rakesh Aggarwal, who had taken a shop owned by Urmila Jindal on rent, said, "I have their shop for the last 30 years. Till 1937, they had a business of extraction of mustard oil but later they closed it down and ventured into other areas."
Rakesh Jindal alleged that the police were not serious about the security in the area and hat there have been cases of burglaries.
Immediately after the incident was reported, Joint Commissioner of Police, Eastern Range, Ravindra Yadav and Special Commissioner of Police, Law and Order(North) SBK Singh visited the spot.
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