New Delhi, June 24 -- A couple in their seventies and a 20-year-old nursing attendant were found murdered with stab wounds in their neck in their flat in Vasant Apartments in south Delhi's Vasant Vihar on Sunday. Since there was no forced entry, the police suspect the involvement of somebody known, either to the couple or the nursing attendant, or both, according to officers involved in the investigation.

The motive of the killings is also unclear. Though there were signs of ransacking in the bedroom, where the couple was found murdered on the bed, police said that it was unlikely that the crime was a robbery that escalated into murder. The couple appear to have been killed in their sleep, the officer cited above said, asking not to be nam...