The 60-year-old grandfather, identified as Ram Kumar, rushed the child, Shivam, to a hospital, where he died. The hospital authorities called up the police control room, said police.
"A case has been registered under Section 304 (culpable homicide not amounting to murder) and Kumar was arrested immediately," said DCP (Southwest) R A Sanjeev, adding that Kuamr was later released on bail.
According to the police, the incident was reported around 10.45 PM when Kumar was firing in the air with his licenced revolver, which excited his six-year-old grandson.
Shivam's body was handed over to his relatives after post-mortem today, police added.
