India, Dec. 1 -- A 52-year-old man was shot dead by a group of unknown assailants in south Delhi's Aya Nagar early on Sunday.

The man, identified as Ratan Ram, had stepped out in the morning to buy milk when the incident happened. No arrests have been made yet.

Ram's family alleged that it was a "revenge killing" as his son, Deepak, had killed a businessman named Arun Lohia in May this year.

According to police, Arun was in his SUV with his father and were returning from a court when Deepak and another assailant fired more than 10 rounds at them near Chhatarpur metro station, killing Lohia. Deepak and his associates, Yogesh and Ajay, were arrested within two weeks of the crime following a brief exchange of fire with the police.

Police...