The dead were seven women and four men from one family living in a two-story house in Burana district of North Delhi. The bodies were sent for autopsy, but there was no message of suicide, the report said.
Two of the men are brothers, one a carpenter and the other a grocer, who run their work from the same home they have been living in for more than two decades.
NDTV quoted a neighbor as saying he went to buy the milk from the store run by one of the brothers on the ground floor of the house and found it closed after its usual opening time. "I went up the stairs and saw the dead bodies and informed the police."