The family included two brothers, their two wives who had two teenage sons and two teenage daughters each, also, their aged mother, sister and her child were found dead. "We can't rule out anything", he said. A neighbour in the Burari district found the victims early on Sunday, police said.
However, police also said there were no bullet marks on the bodies and no signs of forced entry into the home.
The police said that these notes are being carefully investigated to further establish its links with the deaths.
He added, "Coincidentally, these notes have a strong similarity to the manner in which the mouth, eyes etc of the deceased were tied and taped". The neighbour said he spoke to one of the victims Saturday night and found no sign of any stress, the report said. Police said the two gangs are headed by men whose enmity goes back to 2013.
The family migrated to the capital from Rajasthan about two decades ago and police were trying to get in touch with relatives there.
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The family reportedly stayed at a double-storey home in Sant Nagar area of Burari and ran a grocery shop and plywood business.
Sixty-year-old Partibha, daughter of Narayan also lived with the family, the dead body of 10 people were found on the first floor while Narayan's body was found in other room. On Sunday morning, a neighbor who routinely took morning walks with the homeowner found the family dead, including the businessman, when he came for a visit, according to The Hindustan Times. Neighbors had not heard anything untoward, police said.
"I saw the bodies hanging, stools lying around, and my wife's aunt sprawled on the floor by the bed".
All the family members had died and there were no witnesses.
"No father can kill his own son. These are murders", he said.
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Delhi Chief Minister Arvind Kejriwal said he spoke to area residents, saying that everyone was shocked by the deaths.
This angle was being investigated and a case of murder registered, the statement said.
Police is now awaiting the post-mortem reports of the bodies, which would clear if one of the family members killed the rest and then committed suicide or was it a suicide pact.
Police official Rajesh Khurana told reporters that all angles were being investigated.
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