Ten of the victims were found hanging from an iron grill ceiling, while an elderly woman was found lying on the floor, police said. No suicide note has been found yet.
The bodies were blind-folded and gagged, and were found hanging from the ceiling of the house opposite Guru Govind Singh Hospital.
Seven of the dead were women, while four were men. The family ran a provisional store on the ground floor of their house and were in furnishing business, reported Mirror Now. Relatives of the deceased are being called to get more information about the family. They have been living in the area for the last two decades.
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'In a video posted on Twitter by Kejriwal's ruling party, the neighbors are heard telling Kejriwal that the family was busy with wedding preparations.
Police official Rajesh Khurana told reporters that all angles were being investigated.
The police in New Delhi are trying to ascertain if the deaths were by suicide or murder. But upon reaching the spot, it was found that 11 members of a family had died.