India, Aug. 21 -- A couple in their 40s and their 24-year-old son were found murdered with their throats slit at their two-storey residence in Satbari Kharak Village near Maidangarhi in south Delhi on Wednesday evening, police said.

The couple's other son, who is 22 and had been undergoing psychiatric treatment for the past few years, was missing from the house. Police said they suspect he was the killer, as he had telephonically informed his friend that he had killed his family members.

"As of now, the couple's missing son, Siddharth Singh, is our prime suspect. As per the local inquiry, Siddharth was undergoing psychiatric treatment. He told someone that he had murdered his family and would not live here anymore. Our teams are looking...